刚刚！特朗普众叛亲离！美国多州“造反”求援中国！
来源：天下热点追踪
今天，美国的确诊数字持续狂飙，单日新增再创新高，
达到了31163多例，总数也直奔30万而去。
经历过武汉疫情大爆发的老铁们都应该知道，
这个数字对一个国家意味着什么？
克莱因瓶是一个不可定向的二维紧流形，而球面或轮胎面是可 克莱因瓶 克莱因瓶 定向的二维紧流形。如果观Sophie Amundsen was on her way home from school. She had walked the first part of the way with Joanna. They had been discussing robots. Joanna thought the hum From time to time there would be a few letters from the bank for her father, but then he was not a normal father. Sophie's father was the captain of a big oil tanker, and was away for most of the year. During the few weeks at a time when he was at home, he would shuffle around the house making it nice and cozy for Sophie and her mother. But when he was at sea he could seem very distant. There was only one letter in the mailbox--and it was for Sophie. The white envelope read: "Sophie Amundsen, 3 Clover Close." That was all; it did not say who it was from. There was no stamp on it either. As soon as Sophie had closed the gate behind her she opened the envelope. It contained only a slip of paper no bigger than the envelope. It read: Who are you? Nothing else, only the three words, written by hand, and followed by a large question mark. She looked at the envelope again. The letter was definitely for her. Who could have dropped it in the mailbox? Sophie let herslly wanted her to be called Lillemor. Sophie tried to imagine herself shaking hands and introducing herself as Lillemor Amundsen, but it seemed all wrong. It was someone else who kept introducing herself. She jumped up and went into the bathroom with the strange letter in her hand. She stood in front of the mirror and stared into her own eyes. "I am Sophie Amundsen," she said. The girl in the mirror did not react with as much as a twitch. Whatever Sophie did, she did exactly the same. Sophie tried to beat her reflection to it with a lightning movement but the other girl was just as fast. "Who are you?" Sophie asked. She received no response to this either, but felt a momentary confusion as to whether it was she or her reflection who had asked the question. Sophie pressed her index finger to the nose in the mirror and said, "You are me." As she got no answer to this, she turned the sentence around and said, "I am you." Sophie Amundsen was often dissatisfied with her appearance. She was frequently told that she had beautiful almond-shaped eyes, but that was probably just something people said because her nose was too small and her mouth was a bit too big. And her ears were much too close to her eyes. Worst of all was her straight hair, which it was impossible to do anything with. Sometimes her father would stroke her hair and call her "the girl with the flaxen hair," after a piece of music by Claude Debussy. It was all right for him, he was not condemned to living with this straight dark hair. Neither mousse nor styling gel had the slightest effect on Sophie's hair. Sometimes she thought she was so ugly that she wondered if she was malformed at birth. Her mother always went on about her difficult labor. But was that really what determined how you looked? Wasn't it odd that she didn't know who she was? And wasn't it unreasonable that she hadn't been allowed to have any say in what she would look like? Her looks had just been dumped on her. She could choose her own friends, but she certainly hadn't chosen herself. She had not even chosen to be a human being. What was a human being? Sophie looked up at the girl in the mirror again. "I think I'll go upstairs and do my biology homework," she said, almost apologetically. Once she was out in the hall, she thought, No, I'd rather go out in the garden. "Kitty, kitty, kitty!" Sophie chased the cat out onto the doorstep and closed the front door behind her. As she stood outside on the gravel path with the mysterious letter in her hand, the strangest feeling came over her. She felt like a doll that had suddenly been brought to life by the wave of a magic wand. Wasn't it extraordinary to be in the world right now, wandering around in a wonderful adventure! Sherekan sprang lightly across the gravel and slid into a dense clump of red-currant bushes. A live cat, vibrant with energy from its white whiskers to the twitching tail at the end of its sleek body. It was here in the garden too, but hardly aware of it in the same way as Sophie. As Sophie started to think about being alive, she began to realize that she would not be alive forever. I am in the world now, she thought, but one day I shall be gone. Was there a life after death? This was another question the cat was blissfully unaware of. It was not long since Sophie's grandmother had died. For more than six months Sophie had missed her every single day. How unfair that life had to end! Sophie stood on the gravel path, thinking. She tried to think extra hard about being alive so as to forget that she would not be alive forever. But it was impossible. As soon as she concentrated on being alive now, the thought of dying also came into her mind. The same thing happened the other way around: only by conjuring up an intense feeling of one day being dead could she appreciate how terribly good it was to be alive. It was like two sides of a coin that she kept turning over and over. And the bigger and clearer one side of the coin became, the bigger and clearer the other side became too. You can't experience being alive without realizing that you have to die, she thought. But it's just as impossible to realize you have to die without thinking how incredibly amazing it is to be alive. Sophie remembered Granny saying something like that the day the doctor told her she was ill. "I never realized how rich life was until now," she said. How tragic that most people had to get ill before they understood what a gift it was to be alive. Or else they had to find a mysterious letter in the mailbox! Perhaps she should go and see if any more letters had arrived. Sophie hurried to the gate and looked inside the green mailbox. She was startled to find that it contained another white envelope, exactly like the first. But the mailbox had definitely been empty when she took the first envelope! This envelope had her name on it as well. She tore it open and fished out a note the same size as the first one. Where does the world come from? it said. I don't know, Sophie thought. Surely nobody really knows. And yet--Sophie thought it was a fair question. For the first time in her life she felt it wasn't right to live in the world without at least inquiring where it came from. The mysterious letters had made Sophie's head spin. She decided to go and sit in the den. The den was Sophie's top secret hiding place. It was where she went when she was terribly angry, terribly miserable, or terribly happy. Today she was simply confused. * * * The red house was surrounded by a large garden with lots of flowerbeds, fruit bushes, fruit trees of different kinds, a spacious lawn with a glider and a little gazebo that Granddad had built for Granny when she lost their first child a few weeks after it was born. The child's name was Marie. On her gravestone were the words: "Little Marie to us came, greeted us, and left again." Down in a corner of the garden behind all the raspberry bushes was a dense thicket where neither flowers nor berries would grow. Actually, it was an old hedge that had once marked the boundary to the woods, but because nobody had trimmed it for the last twenty years it had grown into a tangled and impenetrable mass. Granny used to say the hedge made it harder for the foxes to take the chickens during the war, when the chickens had free range of the garden. To everyone but Sophie, the old hedge was just as useless as the rabbit hutches at the other end of the garden. But that was only because they hadn't discovered Sophie's secret. Sophie had known about the little hole in the hedge for as long as she could remember. When she crawled through it she came into a large cavity between the bushes. It was like a little house. She knew nobody would find her there. Clutching the two envelopes in her hand, Sophie ran through the garden, crouched down on all fours, and wormed her way through the hedge. The den was almost high enough for her to stand upright, but today she sat down on a clump of gnarled roots. From there she could look out through tiny peepholes between the twigs and leaves. Although none of the holes was bigger than a small coin, she had a good view beginning. Oh, drat! She opened the two envelopes again. Who are you? Where does the world come from? What annoying questions! And anyway where did the letters come from? That was just as mysterious, almost. Who had jolted Sophie out of her everyday existence and suddenly brought her face to face with the great riddles of the universe? For the third time Sophie went to the mailbox. The mailman had just delivered the day's mail. Sophie fished out a bulky pile of junk mail, periodicals, and a couple of letters for her mother. There was also a postcard of a tropical beach. She turned the card over. It had a Nor-wegian stamp on it and was postmarked "UN Battalion." Could it be from Dad? But wasn't he in a completely different place? It wasn't his handwriting either. Sophie felt her pulse quicken a little as she saw who the postcard was addressed to: "Hilde Moller Knag, c/o Sophie Amundsen, 3 Clover Close ..." The rest of the address was correct. The card read: Dear Hilde, Happy 15th birthday! As I'm sure you'll understand, I want to give you a present that will help you grow. Forgive me for sending the card c/o Sophie. It was the easiest way. Love from Dad. Sophie raced back to the house and into the kitchen. Her mind was in a turmoil. Who was this "Hilde," whose fifteenth birthday was just a month before her own? Sophie got out the telephone book. There were a lot of people called Moller, and quite a few called Knag. But there was nobody in the entire directory called Moller Knag. She examined the mysterious card again. It certainly seemed genuine enough; it had a stamp and a postmark. Why would a father send a birthday card to Sophie's address when it was quite obviously intended to go somewhere else? What kind of father would cheat his own daughter of a birthday card by purposely sending it astray? How could it be "the easiest way"? And above all, how was she supposed to trace this Hilde person? So now Sophie had another problem to worry about. She tried to get her thoughts in order: This afternoon, in the space of two short hours, she had been presented with three problems. The first problem was who had put the two white envelopes in her mailbox. The second was the difficult questions these letters contained. The third problem was who Hilde Moller Knag could be, and why Sophie had been sent her birthday card. She was sure that the three problems were interconnected in some way. They had to be, because until today she had lived a perfectly ordinary life.察克莱因瓶，有一点似乎令人困惑－－克莱因瓶的瓶颈和瓶身是相交的，换句话说，瓶颈上的某些点和瓶壁上的某些点占据了三维空间中的同一个位置。我们可以把克莱因瓶放在四维空间中理解：克莱因瓶是一个在四维空间中才可能真正表现出来的曲面。如果我们一定要把它表现在我们生活的三维空间中，我们只好将就点，把它表现得似乎是自己和自己相交一样。克莱因瓶的瓶颈是广泛地应用到了建筑，艺术，工业生产中。三维空间里的克莱因瓶 拓扑学的定义编辑 克莱因瓶定义为正方形区域 [0,1]×[0,1] 模掉等价关系(0,y)~(1,y), 0≤y≤1 和 (x,0)~(1-x,1), 0≤x≤1。类似于 Mobius Band, 克莱因瓶不可定向。但 Mobius 带可嵌入 ，而克莱因瓶只能嵌入四维（或更高维）空间。莫比乌斯带编辑 把一条纸带的一段扭180°，再和另一端粘起来就得到一条莫比乌斯带的模型。这也是一个只有莫比乌斯带、一个面的曲面，但是和球面、轮胎面和克莱因瓶不同的是，它有边（注意，它只有一条边）。如果我们把两条莫比烈爆炸。一般认为质量小于9倍太阳质量左右的恒星，在经历引力坍缩的过程后是无法形成超新星的。[75] 在大质量恒星演化到晚期，内部不能产生新的能量，巨大的引力将整个星体迅速向中心坍缩，将中心物质都压成中子状态，形成中子星，而外层下坍的物质遇到这坚硬的“中子核”反弹引起爆炸。这就成为超新星爆发，质量更大时，中心更可形成黑洞。[76] 在超新星爆发的过程中所释放的能量，需要我们的太阳燃烧900亿年才能与之相当。[77] 超新星研究有着关乎人类自身命运的深层意义。如果一颗超新星爆发的位置非常接近地球，目前国际天文学界普遍认为此距离在100光年以内，它就能够对地球的生物圈产生明显的影响，这样的超新星被称为近地超新星。有研究认为，在地球历史上的奥陶纪大灭绝，就是一颗近地超新星引起的，这次灭绝导致当时地球近60%的海洋生物消失。[78]
克莱因瓶是一个不可定向的二维紧流形，而球面或轮胎面是可 克莱因瓶 克莱因
美国50个州已经有30多个州进入重大灾难状态，
与此同时，美国多艘航母已经沦陷成为海上棺材。
美国医院的医护人员因为缺少物资自身都无法保护，纷纷辞职保命。
这更加剧了美国医护人员的紧张。
医院更是成了人间炼狱，
太平间早已无法停放尸体，死亡患者的尸体被随意丢在医院的过道里，
那一幕，恍如世界末日。
然而，都到了火烧眉毛的时候了，
美国还不忘了对中国肆意抹黑。
称是中国隐瞒病情，以至于让美国乃至于欧洲疫情扩散。
中国才是这场世界疫情的元凶。
与此同时，美国还开足马力，对中国制造四面围堵，
称中国的N95口罩和呼吸机不符合美国标准而拒绝进口。
在拒绝中国制造的同时，美国还积极准备采购了10万个裹尸袋，做好了死亡十万人的准备。
一方面是国内民众急需物资救急，
另一方面却是美国政府固执己见，
宁肯拿着国人的生命做代价，也要和中国死磕到底。
针对美国政府的行为，
美国媒体怒了，多家媒体痛批特朗普政府草菅人命，
美国已经到了生死存亡的地步了。
竟然还想着围堵中国，还用政治眼光和中国打交道。
美国多个州的州长也怒了。
多次怒批特朗普的美国纽约纽约州州长率先“造反”了！
一再请求特朗普紧急支援呼吸机但一直苦等无果的科莫果断抛开特朗普政府，
不顾联邦政府的禁令，开始向中国紧急求援采购呼吸机了。
纽约州是美国疫情最严重的一个州，
确诊人数高达近10万，已经有2373人死亡。
更有很多患者来不及确诊就已经死亡了。
但是望眼欲穿之下，特朗普一共才给了纽约州400台呼吸机，并且有一半以上还不能使用。而纽约多家医院已经防护用品早已经用尽，
特朗普只是称这个需要各州自行想办法解决。
再等美国政府支援，纽约州恐怕要全军覆没了。
终于，美国纽约州州长科莫被逼上梁山造反了。
据科莫称：他已经对中方发起了紧急求援，希望从中国进口呼吸机。
面对纽约州的惨境和纽约州的求援，
中国答应帮忙供应呼吸机。
双方已经签订了17000台呼吸机的订单，每台订单价格2.5万美元。
说实话，这可是一个良心价呀。
克莱因瓶是一个不可定向的二维紧流形，而球面或轮胎面是可 克莱因瓶 克莱因瓶 定向的二维紧流形。如果观Sophie Amundsen was on her way home from school. She had walked the first part of the way with Joanna. They had been discussing robots. Joanna thought the hum From time to time there would be a few letters from the bank for her father, but then he was not a normal father. Sophie's father was the captain of a big oil tanker, and was away for most of the year. During the few weeks at a time when he was at home, he would shuffle around the house making it nice and cozy for Sophie and her mother. But when he was at sea he could seem very distant. There was only one letter in the mailbox--and it was for Sophie. The white envelope read: "Sophie Amundsen, 3 Clover Close." That was all; it did not say who it was from. There was no stamp on it either. As soon as Sophie had closed the gate behind her she opened the envelope. It contained only a slip of paper no bigger than the envelope. It read: Who are you? Nothing else, only the three words, written by hand, and followed by a large question mark. She looked at the envelope again. The letter was definitely for her. Who could have dropped it in the mailbox? Sophie let herslly wanted her to be called Lillemor. Sophie tried to imagine herself shaking hands and introducing herself as Lillemor Amundsen, but it seemed all wrong. It was someone else who kept introducing herself. She jumped up and went into the bathroom with the strange letter in her hand. She stood in front of the mirror and stared into her own eyes. "I am Sophie Amundsen," she said. The girl in the mirror did not react with as much as a twitch. Whatever Sophie did, she did exactly the same. Sophie tried to beat her reflection to it with a lightning movement but the other girl was just as fast. "Who are you?" Sophie asked. She received no response to this either, but felt a momentary confusion as to whether it was she or her reflection who had asked the question. Sophie pressed her index finger to the nose in the mirror and said, "You are me." As she got no answer to this, she turned the sentence around and said, "I am you." Sophie Amundsen was often dissatisfied with her appearance. She was frequently told that she had beautiful almond-shaped eyes, but that was probably just something people said because her nose was too small and her mouth was a bit too big. And her ears were much too close to her eyes. Worst of all was her straight hair, which it was impossible to do anything with. Sometimes her father would stroke her hair and call her "the girl with the flaxen hair," after a piece of music by Claude Debussy. It was all right for him, he was not condemned to living with this straight dark hair. Neither mousse nor styling gel had the slightest effect on Sophie's hair. Sometimes she thought she was so ugly that she wondered if she was malformed at birth. Her mother always went on about her difficult labor. But was that really what determined how you looked? Wasn't it odd that she didn't know who she was? And wasn't it unreasonable that she hadn't been allowed to have any say in what she would look like? Her looks had just been dumped on her. She could choose her own friends, but she certainly hadn't chosen herself. She had not even chosen to be a human being. What was a human being? Sophie looked up at the girl in the mirror again. "I think I'll go upstairs and do my biology homework," she said, almost apologetically. Once she was out in the hall, she thought, No, I'd rather go out in the garden. "Kitty, kitty, kitty!" Sophie chased the cat out onto the doorstep and closed the front door behind her. As she stood outside on the gravel path with the mysterious letter in her hand, the strangest feeling came over her. She felt like a doll that had suddenly been brought to life by the wave of a magic wand. Wasn't it extraordinary to be in the world right now, wandering around in a wonderful adventure! Sherekan sprang lightly across the gravel and slid into a dense clump of red-currant bushes. A live cat, vibrant with energy from its white whiskers to the twitching tail at the end of its sleek body. It was here in the garden too, but hardly aware of it in the same way as Sophie. As Sophie started to think about being alive, she began to realize that she would not be alive forever. I am in the world now, she thought, but one day I shall be gone. Was there a life after death? This was another question the cat was blissfully unaware of. It was not long since Sophie's grandmother had died. For more than six months Sophie had missed her every single day. How unfair that life had to end! Sophie stood on the gravel path, thinking. She tried to think extra hard about being alive so as to forget that she would not be alive forever. But it was impossible. As soon as she concentrated on being alive now, the thought of dying also came into her mind. The same thing happened the other way around: only by conjuring up an intense feeling of one day being dead could she appreciate how terribly good it was to be alive. It was like two sides of a coin that she kept turning over and over. And the bigger and clearer one side of the coin became, the bigger and clearer the other side became too. You can't experience being alive without realizing that you have to die, she thought. But it's just as impossible to realize you have to die without thinking how incredibly amazing it is to be alive. Sophie remembered Granny saying something like that the day the doctor told her she was ill. "I never realized how rich life was until now," she said. How tragic that most people had to get ill before they understood what a gift it was to be alive. Or else they had to find a mysterious letter in the mailbox! Perhaps she should go and see if any more letters had arrived. Sophie hurried to the gate and looked inside the green mailbox. She was startled to find that it contained another white envelope, exactly like the first. But the mailbox had definitely been empty when she took the first envelope! This envelope had her name on it as well. She tore it open and fished out a note the same size as the first one. Where does the world come from? it said. I don't know, Sophie thought. Surely nobody really knows. And yet--Sophie thought it was a fair question. For the first time in her life she felt it wasn't right to live in the world without at least inquiring where it came from. The mysterious letters had made Sophie's head spin. She decided to go and sit in the den. The den was Sophie's top secret hiding place. It was where she went when she was terribly angry, terribly miserable, or terribly happy. Today she was simply confused. * * * The red house was surrounded by a large garden with lots of flowerbeds, fruit bushes, fruit trees of different kinds, a spacious lawn with a glider and a little gazebo that Granddad had built for Granny when she lost their first child a few weeks after it was born. The child's name was Marie. On her gravestone were the words: "Little Marie to us came, greeted us, and left again." Down in a corner of the garden behind all the raspberry bushes was a dense thicket where neither flowers nor berries would grow. Actually, it was an old hedge that had once marked the boundary to the woods, but because nobody had trimmed it for the last twenty years it had grown into a tangled and impenetrable mass. Granny used to say the hedge made it harder for the foxes to take the chickens during the war, when the chickens had free range of the garden. To everyone but Sophie, the old hedge was just as useless as the rabbit hutches at the other end of the garden. But that was only because they hadn't discovered Sophie's secret. Sophie had known about the little hole in the hedge for as long as she could remember. When she crawled through it she came into a large cavity between the bushes. It was like a little house. She knew nobody would find her there. Clutching the two envelopes in her hand, Sophie ran through the garden, crouched down on all fours, and wormed her way through the hedge. The den was almost high enough for her to stand upright, but today she sat down on a clump of gnarled roots. From there she could look out through tiny peepholes between the twigs and leaves. Although none of the holes was bigger than a small coin, she had a good view beginning. Oh, drat! She opened the two envelopes again. Who are you? Where does the world come from? What annoying questions! And anyway where did the letters come from? That was just as mysterious, almost. Who had jolted Sophie out of her everyday existence and suddenly brought her face to face with the great riddles of the universe? For the third time Sophie went to the mailbox. The mailman had just delivered the day's mail. Sophie fished out a bulky pile of junk mail, periodicals, and a couple of letters for her mother. There was also a postcard of a tropical beach. She turned the card over. It had a Nor-wegian stamp on it and was postmarked "UN Battalion." Could it be from Dad? But wasn't he in a completely different place? It wasn't his handwriting either. Sophie felt her pulse quicken a little as she saw who the postcard was addressed to: "Hilde Moller Knag, c/o Sophie Amundsen, 3 Clover Close ..." The rest of the address was correct. The card read: Dear Hilde, Happy 15th birthday! As I'm sure you'll understand, I want to give you a present that will help you grow. Forgive me for sending the card c/o Sophie. It was the easiest way. Love from Dad. Sophie raced back to the house and into the kitchen. Her mind was in a turmoil. Who was this "Hilde," whose fifteenth birthday was just a month before her own? Sophie got out the telephone book. There were a lot of people called Moller, and quite a few called Knag. But there was nobody in the entire directory called Moller Knag. She examined the mysterious card again. It certainly seemed genuine enough; it had a stamp and a postmark. Why would a father send a birthday card to Sophie's address when it was quite obviously intended to go somewhere else? What kind of father would cheat his own daughter of a birthday card by purposely sending it astray? How could it be "the easiest way"? And above all, how was she supposed to trace this Hilde person? So now Sophie had another problem to worry about. She tried to get her thoughts in order: This afternoon, in the space of two short hours, she had been presented with three problems. The first problem was who had put the two white envelopes in her mailbox. The second was the difficult questions these letters contained. The third problem was who Hilde Moller Knag could be, and why Sophie had been sent her birthday card. She was sure that the three problems were interconnected in some way. They had to be, because until today she had lived a perfectly ordinary life.察克莱因瓶，有一点似乎令人困惑－－克莱因瓶的瓶颈和瓶身是相交的，换句话说，瓶颈上的某些点和瓶壁上的某些点占据了三维空间中的同一个位置。我们可以把克莱因瓶放在四维空间中理解：克莱因瓶是一个在四维空间中才可能真正表现出来的曲面。如果我们一定要把它表现在我们生活的三维空间中，我们只好将就点，把它表现得似乎是自己和自己相交一样。克莱因瓶的瓶颈是广泛地应用到了建筑，艺术，工业生产中。三维空间里的克莱因瓶 拓扑学的定义编辑 克莱因瓶定义为正方形区域 [0,1]×[0,1] 模掉等价关系(0,y)~(1,y), 0≤y≤1 和 (x,0)~(1-x,1), 0≤x≤1。类似于 Mobius Band, 克莱因瓶不可定向。但 Mobius 带可嵌入 ，而克莱因瓶只能嵌入四维（或更高维）空间。莫比乌斯带编辑 把一条纸带的一段扭180°，再和另一端粘起来就得到一条莫比乌斯带的模型。这也是一个只有莫比乌斯带、一个面的曲面，但是和球面、轮胎面和克莱因瓶不同的是，它有边（注意，它只有一条边）。如果我们把两条莫比烈爆炸。一般认为质量小于9倍太阳质量左右的恒星，在经历引力坍缩的过程后是无法形成超新星的。[75] 在大质量恒星演化到晚期，内部不能产生新的能量，巨大的引力将整个星体迅速向中心坍缩，将中心物质都压成中子状态，形成中子星，而外层下坍的物质遇到这坚硬的“中子核”反弹引起爆炸。这就成为超新星爆发，质量更大时，中心更可形成黑洞。[76] 在超新星爆发的过程中所释放的能量，需要我们的太阳燃烧900亿年才能与之相当。[77] 超新星研究有着关乎人类自身命运的深层意义。如果一颗超新星爆发的位置非常接近地球，目前国际天文学界普遍认为此距离在100光年以内，它就能够对地球的生物圈产生明显的影响，这样的超新星被称为近地超新星。有研究认为，在地球历史上的奥陶纪大灭绝，就是一颗近地超新星引起的，这次灭绝导致当时地球近60%的海洋生物消失。[78]
克莱因瓶是一个不可定向的二维紧流形，而球面或轮胎面是可 克莱因瓶 克莱因
但是纽约州这2万多台呼吸机，中国只能先给提供2500台。
没办法，排队的人太多了。
看到纽约州求助中国成功了，
美国另一个州也宣布加入了“造反”的行列。
就在昨天，美国科罗拉多州州长波利斯宣布：
该州也正在与中国厂家接洽购买医疗物资。
波利斯愤怒地说，特朗普提供给我们的物资远远不够，
我们只能靠自己去购买医疗装备。
联邦政府不但不给我们提供医疗物资，
竟然还用标准来限制中国的物资供应美国，
我们管不了这么多了，
正在和中国洽谈N95口罩的进口事宜。
就在今天，美国的又一个州马萨诸塞州也造反了。
不顾特朗普的反对，决定在中国采购170万只的口罩，
经过多方协调和联络，终于达成了从中国进口120万只KN95口罩合约。
并在今天用一架私人飞机将120万只救急kN95口罩运回了美国。
这可都是晋级的救命口罩啊！
请记住Kn 95口罩，这是中国标准！
这个时候。很多美国政客们才回过味儿来了，
再跟着美国彭佩奥和中国死扛到底，
继续这样抗疫下去，只能有更多的美国无辜民众的死亡。
管你什么美国标准，欧洲标准，关键时刻救命才是真标准。
多年来，欧美国家一直对中国制造围堵打压，
用欧美标准把中国制造排除在欧美市场之外。
然而，经历了一场重大疫情的中国，
用效果来证明中国制造在重大疫情面前是能救命的。
在巨大的灾难来袭面前，
疫情将美国政客精心围堵中国的计划击的粉碎。
在美国疫情已经失控泛滥之下，
如果特朗普还是抱着围堵中国不放，
美国各州“造反”只是个开始，
等待特朗普政府的只能是更多的众叛亲离！
就在小编截稿时，收到最新消息，
由于美国医护物资紧缺严重，
加上各州擅自行动，让美国的禁令形同虚设，
美国疾控中心准备解除禁止从中国进口口罩的禁令，
在残酷的现实面前，美国终于要低下高傲的头颅了。
来源：天下热点追踪
今天，美国的确诊数字持续狂飙，单日新增再创新高，
达到了31163多例，总数也直奔30万而去。
经历过武汉疫情大爆发的老铁们都应该知道，
这个数字对一个国家意味着什么？
克莱因瓶是一个不可定向的二维紧流形，而球面或轮胎面是可 克莱因瓶 克莱因瓶 定向的二维紧流形。如果观Sophie Amundsen was on her way home from school. She had walked the first part of the way with Joanna. They had been discussing robots. Joanna thought the hum From time to time there would be a few letters from the bank for her father, but then he was not a normal father. Sophie's father was the captain of a big oil tanker, and was away for most of the year. During the few weeks at a time when he was at home, he would shuffle around the house making it nice and cozy for Sophie and her mother. But when he was at sea he could seem very distant. There was only one letter in the mailbox--and it was for Sophie. The white envelope read: "Sophie Amundsen, 3 Clover Close." That was all; it did not say who it was from. There was no stamp on it either. As soon as Sophie had closed the gate behind her she opened the envelope. It contained only a slip of paper no bigger than the envelope. It read: Who are you? Nothing else, only the three words, written by hand, and followed by a large question mark. She looked at the envelope again. The letter was definitely for her. Who could have dropped it in the mailbox? Sophie let herslly wanted her to be called Lillemor. Sophie tried to imagine herself shaking hands and introducing herself as Lillemor Amundsen, but it seemed all wrong. It was someone else who kept introducing herself. She jumped up and went into the bathroom with the strange letter in her hand. She stood in front of the mirror and stared into her own eyes. "I am Sophie Amundsen," she said. The girl in the mirror did not react with as much as a twitch. Whatever Sophie did, she did exactly the same. Sophie tried to beat her reflection to it with a lightning movement but the other girl was just as fast. "Who are you?" Sophie asked. She received no response to this either, but felt a momentary confusion as to whether it was she or her reflection who had asked the question. Sophie pressed her index finger to the nose in the mirror and said, "You are me." As she got no answer to this, she turned the sentence around and said, "I am you." Sophie Amundsen was often dissatisfied with her appearance. She was frequently told that she had beautiful almond-shaped eyes, but that was probably just something people said because her nose was too small and her mouth was a bit too big. And her ears were much too close to her eyes. Worst of all was her straight hair, which it was impossible to do anything with. Sometimes her father would stroke her hair and call her "the girl with the flaxen hair," after a piece of music by Claude Debussy. It was all right for him, he was not condemned to living with this straight dark hair. Neither mousse nor styling gel had the slightest effect on Sophie's hair. Sometimes she thought she was so ugly that she wondered if she was malformed at birth. Her mother always went on about her difficult labor. But was that really what determined how you looked? Wasn't it odd that she didn't know who she was? And wasn't it unreasonable that she hadn't been allowed to have any say in what she would look like? Her looks had just been dumped on her. She could choose her own friends, but she certainly hadn't chosen herself. She had not even chosen to be a human being. What was a human being? Sophie looked up at the girl in the mirror again. "I think I'll go upstairs and do my biology homework," she said, almost apologetically. Once she was out in the hall, she thought, No, I'd rather go out in the garden. "Kitty, kitty, kitty!" Sophie chased the cat out onto the doorstep and closed the front door behind her. As she stood outside on the gravel path with the mysterious letter in her hand, the strangest feeling came over her. She felt like a doll that had suddenly been brought to life by the wave of a magic wand. Wasn't it extraordinary to be in the world right now, wandering around in a wonderful adventure! Sherekan sprang lightly across the gravel and slid into a dense clump of red-currant bushes. A live cat, vibrant with energy from its white whiskers to the twitching tail at the end of its sleek body. It was here in the garden too, but hardly aware of it in the same way as Sophie. As Sophie started to think about being alive, she began to realize that she would not be alive forever. I am in the world now, she thought, but one day I shall be gone. Was there a life after death? This was another question the cat was blissfully unaware of. It was not long since Sophie's grandmother had died. For more than six months Sophie had missed her every single day. How unfair that life had to end! Sophie stood on the gravel path, thinking. She tried to think extra hard about being alive so as to forget that she would not be alive forever. But it was impossible. As soon as she concentrated on being alive now, the thought of dying also came into her mind. The same thing happened the other way around: only by conjuring up an intense feeling of one day being dead could she appreciate how terribly good it was to be alive. It was like two sides of a coin that she kept turning over and over. And the bigger and clearer one side of the coin became, the bigger and clearer the other side became too. You can't experience being alive without realizing that you have to die, she thought. But it's just as impossible to realize you have to die without thinking how incredibly amazing it is to be alive. Sophie remembered Granny saying something like that the day the doctor told her she was ill. "I never realized how rich life was until now," she said. How tragic that most people had to get ill before they understood what a gift it was to be alive. Or else they had to find a mysterious letter in the mailbox! Perhaps she should go and see if any more letters had arrived. Sophie hurried to the gate and looked inside the green mailbox. She was startled to find that it contained another white envelope, exactly like the first. But the mailbox had definitely been empty when she took the first envelope! This envelope had her name on it as well. She tore it open and fished out a note the same size as the first one. Where does the world come from? it said. I don't know, Sophie thought. Surely nobody really knows. And yet--Sophie thought it was a fair question. For the first time in her life she felt it wasn't right to live in the world without at least inquiring where it came from. The mysterious letters had made Sophie's head spin. She decided to go and sit in the den. The den was Sophie's top secret hiding place. It was where she went when she was terribly angry, terribly miserable, or terribly happy. Today she was simply confused. * * * The red house was surrounded by a large garden with lots of flowerbeds, fruit bushes, fruit trees of different kinds, a spacious lawn with a glider and a little gazebo that Granddad had built for Granny when she lost their first child a few weeks after it was born. The child's name was Marie. On her gravestone were the words: "Little Marie to us came, greeted us, and left again." Down in a corner of the garden behind all the raspberry bushes was a dense thicket where neither flowers nor berries would grow. Actually, it was an old hedge that had once marked the boundary to the woods, but because nobody had trimmed it for the last twenty years it had grown into a tangled and impenetrable mass. Granny used to say the hedge made it harder for the foxes to take the chickens during the war, when the chickens had free range of the garden. To everyone but Sophie, the old hedge was just as useless as the rabbit hutches at the other end of the garden. But that was only because they hadn't discovered Sophie's secret. Sophie had known about the little hole in the hedge for as long as she could remember. When she crawled through it she came into a large cavity between the bushes. It was like a little house. She knew nobody would find her there. Clutching the two envelopes in her hand, Sophie ran through the garden, crouched down on all fours, and wormed her way through the hedge. The den was almost high enough for her to stand upright, but today she sat down on a clump of gnarled roots. From there she could look out through tiny peepholes between the twigs and leaves. Although none of the holes was bigger than a small coin, she had a good view beginning. Oh, drat! She opened the two envelopes again. Who are you? Where does the world come from? What annoying questions! And anyway where did the letters come from? That was just as mysterious, almost. Who had jolted Sophie out of her everyday existence and suddenly brought her face to face with the great riddles of the universe? For the third time Sophie went to the mailbox. The mailman had just delivered the day's mail. Sophie fished out a bulky pile of junk mail, periodicals, and a couple of letters for her mother. There was also a postcard of a tropical beach. She turned the card over. It had a Nor-wegian stamp on it and was postmarked "UN Battalion." Could it be from Dad? But wasn't he in a completely different place? It wasn't his handwriting either. Sophie felt her pulse quicken a little as she saw who the postcard was addressed to: "Hilde Moller Knag, c/o Sophie Amundsen, 3 Clover Close ..." The rest of the address was correct. The card read: Dear Hilde, Happy 15th birthday! As I'm sure you'll understand, I want to give you a present that will help you grow. Forgive me for sending the card c/o Sophie. It was the easiest way. Love from Dad. Sophie raced back to the house and into the kitchen. Her mind was in a turmoil. Who was this "Hilde," whose fifteenth birthday was just a month before her own? Sophie got out the telephone book. There were a lot of people called Moller, and quite a few called Knag. But there was nobody in the entire directory called Moller Knag. She examined the mysterious card again. It certainly seemed genuine enough; it had a stamp and a postmark. Why would a father send a birthday card to Sophie's address when it was quite obviously intended to go somewhere else? What kind of father would cheat his own daughter of a birthday card by purposely sending it astray? How could it be "the easiest way"? And above all, how was she supposed to trace this Hilde person? So now Sophie had another problem to worry about. She tried to get her thoughts in order: This afternoon, in the space of two short hours, she had been presented with three problems. The first problem was who had put the two white envelopes in her mailbox. The second was the difficult questions these letters contained. The third problem was who Hilde Moller Knag could be, and why Sophie had been sent her birthday card. She was sure that the three problems were interconnected in some way. They had to be, because until today she had lived a perfectly ordinary life.察克莱因瓶，有一点似乎令人困惑－－克莱因瓶的瓶颈和瓶身是相交的，换句话说，瓶颈上的某些点和瓶壁上的某些点占据了三维空间中的同一个位置。我们可以把克莱因瓶放在四维空间中理解：克莱因瓶是一个在四维空间中才可能真正表现出来的曲面。如果我们一定要把它表现在我们生活的三维空间中，我们只好将就点，把它表现得似乎是自己和自己相交一样。克莱因瓶的瓶颈是广泛地应用到了建筑，艺术，工业生产中。三维空间里的克莱因瓶 拓扑学的定义编辑 克莱因瓶定义为正方形区域 [0,1]×[0,1] 模掉等价关系(0,y)~(1,y), 0≤y≤1 和 (x,0)~(1-x,1), 0≤x≤1。类似于 Mobius Band, 克莱因瓶不可定向。但 Mobius 带可嵌入 ，而克莱因瓶只能嵌入四维（或更高维）空间。莫比乌斯带编辑 把一条纸带的一段扭180°，再和另一端粘起来就得到一条莫比乌斯带的模型。这也是一个只有莫比乌斯带、一个面的曲面，但是和球面、轮胎面和克莱因瓶不同的是，它有边（注意，它只有一条边）。如果我们把两条莫比烈爆炸。一般认为质量小于9倍太阳质量左右的恒星，在经历引力坍缩的过程后是无法形成超新星的。[75] 在大质量恒星演化到晚期，内部不能产生新的能量，巨大的引力将整个星体迅速向中心坍缩，将中心物质都压成中子状态，形成中子星，而外层下坍的物质遇到这坚硬的“中子核”反弹引起爆炸。这就成为超新星爆发，质量更大时，中心更可形成黑洞。[76] 在超新星爆发的过程中所释放的能量，需要我们的太阳燃烧900亿年才能与之相当。[77] 超新星研究有着关乎人类自身命运的深层意义。如果一颗超新星爆发的位置非常接近地球，目前国际天文学界普遍认为此距离在100光年以内，它就能够对地球的生物圈产生明显的影响，这样的超新星被称为近地超新星。有研究认为，在地球历史上的奥陶纪大灭绝，就是一颗近地超新星引起的，这次灭绝导致当时地球近60%的海洋生物消失。[78]
克莱因瓶是一个不可定向的二维紧流形，而球面或轮胎面是可 克莱因瓶 克莱因
美国50个州已经有30多个州进入重大灾难状态，
与此同时，美国多艘航母已经沦陷成为海上棺材。
美国医院的医护人员因为缺少物资自身都无法保护，纷纷辞职保命。
这更加剧了美国医护人员的紧张。
医院更是成了人间炼狱，
太平间早已无法停放尸体，死亡患者的尸体被随意丢在医院的过道里，
那一幕，恍如世界末日。
然而，都到了火烧眉毛的时候了，
美国还不忘了对中国肆意抹黑。
称是中国隐瞒病情，以至于让美国乃至于欧洲疫情扩散。
中国才是这场世界疫情的元凶。
与此同时，美国还开足马力，对中国制造四面围堵，
称中国的N95口罩和呼吸机不符合美国标准而拒绝进口。
在拒绝中国制造的同时，美国还积极准备采购了10万个裹尸袋，做好了死亡十万人的准备。
一方面是国内民众急需物资救急，
另一方面却是美国政府固执己见，
宁肯拿着国人的生命做代价，也要和中国死磕到底。
针对美国政府的行为，
美国媒体怒了，多家媒体痛批特朗普政府草菅人命，
美国已经到了生死存亡的地步了。
竟然还想着围堵中国，还用政治眼光和中国打交道。
美国多个州的州长也怒了。
多次怒批特朗普的美国纽约纽约州州长率先“造反”了！
一再请求特朗普紧急支援呼吸机但一直苦等无果的科莫果断抛开特朗普政府，
不顾联邦政府的禁令，开始向中国紧急求援采购呼吸机了。
纽约州是美国疫情最严重的一个州，
确诊人数高达近10万，已经有2373人死亡。
更有很多患者来不及确诊就已经死亡了。
但是望眼欲穿之下，特朗普一共才给了纽约州400台呼吸机，并且有一半以上还不能使用。而纽约多家医院已经防护用品早已经用尽，
特朗普只是称这个需要各州自行想办法解决。
再等美国政府支援，纽约州恐怕要全军覆没了。
终于，美国纽约州州长科莫被逼上梁山造反了。
据科莫称：他已经对中方发起了紧急求援，希望从中国进口呼吸机。
面对纽约州的惨境和纽约州的求援，
中国答应帮忙供应呼吸机。
双方已经签订了17000台呼吸机的订单，每台订单价格2.5万美元。
说实话，这可是一个良心价呀。
克莱因瓶是一个不可定向的二维紧流形，而球面或轮胎面是可 克莱因瓶 克莱因瓶 定向的二维紧流形。如果观Sophie Amundsen was on her way home from school. She had walked the first part of the way with Joanna. They had been discussing robots. Joanna thought the hum From time to time there would be a few letters from the bank for her father, but then he was not a normal father. Sophie's father was the captain of a big oil tanker, and was away for most of the year. During the few weeks at a time when he was at home, he would shuffle around the house making it nice and cozy for Sophie and her mother. But when he was at sea he could seem very distant. There was only one letter in the mailbox--and it was for Sophie. The white envelope read: "Sophie Amundsen, 3 Clover Close." That was all; it did not say who it was from. There was no stamp on it either. As soon as Sophie had closed the gate behind her she opened the envelope. It contained only a slip of paper no bigger than the envelope. It read: Who are you? Nothing else, only the three words, written by hand, and followed by a large question mark. She looked at the envelope again. The letter was definitely for her. Who could have dropped it in the mailbox? Sophie let herslly wanted her to be called Lillemor. Sophie tried to imagine herself shaking hands and introducing herself as Lillemor Amundsen, but it seemed all wrong. It was someone else who kept introducing herself. She jumped up and went into the bathroom with the strange letter in her hand. She stood in front of the mirror and stared into her own eyes. "I am Sophie Amundsen," she said. The girl in the mirror did not react with as much as a twitch. Whatever Sophie did, she did exactly the same. Sophie tried to beat her reflection to it with a lightning movement but the other girl was just as fast. "Who are you?" Sophie asked. She received no response to this either, but felt a momentary confusion as to whether it was she or her reflection who had asked the question. Sophie pressed her index finger to the nose in the mirror and said, "You are me." As she got no answer to this, she turned the sentence around and said, "I am you." Sophie Amundsen was often dissatisfied with her appearance. She was frequently told that she had beautiful almond-shaped eyes, but that was probably just something people said because her nose was too small and her mouth was a bit too big. And her ears were much too close to her eyes. Worst of all was her straight hair, which it was impossible to do anything with. Sometimes her father would stroke her hair and call her "the girl with the flaxen hair," after a piece of music by Claude Debussy. It was all right for him, he was not condemned to living with this straight dark hair. Neither mousse nor styling gel had the slightest effect on Sophie's hair. Sometimes she thought she was so ugly that she wondered if she was malformed at birth. Her mother always went on about her difficult labor. But was that really what determined how you looked? Wasn't it odd that she didn't know who she was? And wasn't it unreasonable that she hadn't been allowed to have any say in what she would look like? Her looks had just been dumped on her. She could choose her own friends, but she certainly hadn't chosen herself. She had not even chosen to be a human being. What was a human being? Sophie looked up at the girl in the mirror again. "I think I'll go upstairs and do my biology homework," she said, almost apologetically. Once she was out in the hall, she thought, No, I'd rather go out in the garden. "Kitty, kitty, kitty!" Sophie chased the cat out onto the doorstep and closed the front door behind her. As she stood outside on the gravel path with the mysterious letter in her hand, the strangest feeling came over her. She felt like a doll that had suddenly been brought to life by the wave of a magic wand. Wasn't it extraordinary to be in the world right now, wandering around in a wonderful adventure! Sherekan sprang lightly across the gravel and slid into a dense clump of red-currant bushes. A live cat, vibrant with energy from its white whiskers to the twitching tail at the end of its sleek body. It was here in the garden too, but hardly aware of it in the same way as Sophie. As Sophie started to think about being alive, she began to realize that she would not be alive forever. I am in the world now, she thought, but one day I shall be gone. Was there a life after death? This was another question the cat was blissfully unaware of. It was not long since Sophie's grandmother had died. For more than six months Sophie had missed her every single day. How unfair that life had to end! Sophie stood on the gravel path, thinking. She tried to think extra hard about being alive so as to forget that she would not be alive forever. But it was impossible. As soon as she concentrated on being alive now, the thought of dying also came into her mind. The same thing happened the other way around: only by conjuring up an intense feeling of one day being dead could she appreciate how terribly good it was to be alive. It was like two sides of a coin that she kept turning over and over. And the bigger and clearer one side of the coin became, the bigger and clearer the other side became too. You can't experience being alive without realizing that you have to die, she thought. But it's just as impossible to realize you have to die without thinking how incredibly amazing it is to be alive. Sophie remembered Granny saying something like that the day the doctor told her she was ill. "I never realized how rich life was until now," she said. How tragic that most people had to get ill before they understood what a gift it was to be alive. Or else they had to find a mysterious letter in the mailbox! Perhaps she should go and see if any more letters had arrived. Sophie hurried to the gate and looked inside the green mailbox. She was startled to find that it contained another white envelope, exactly like the first. But the mailbox had definitely been empty when she took the first envelope! This envelope had her name on it as well. She tore it open and fished out a note the same size as the first one. Where does the world come from? it said. I don't know, Sophie thought. Surely nobody really knows. And yet--Sophie thought it was a fair question. For the first time in her life she felt it wasn't right to live in the world without at least inquiring where it came from. The mysterious letters had made Sophie's head spin. She decided to go and sit in the den. The den was Sophie's top secret hiding place. It was where she went when she was terribly angry, terribly miserable, or terribly happy. Today she was simply confused. * * * The red house was surrounded by a large garden with lots of flowerbeds, fruit bushes, fruit trees of different kinds, a spacious lawn with a glider and a little gazebo that Granddad had built for Granny when she lost their first child a few weeks after it was born. The child's name was Marie. On her gravestone were the words: "Little Marie to us came, greeted us, and left again." Down in a corner of the garden behind all the raspberry bushes was a dense thicket where neither flowers nor berries would grow. Actually, it was an old hedge that had once marked the boundary to the woods, but because nobody had trimmed it for the last twenty years it had grown into a tangled and impenetrable mass. Granny used to say the hedge made it harder for the foxes to take the chickens during the war, when the chickens had free range of the garden. To everyone but Sophie, the old hedge was just as useless as the rabbit hutches at the other end of the garden. But that was only because they hadn't discovered Sophie's secret. Sophie had known about the little hole in the hedge for as long as she could remember. When she crawled through it she came into a large cavity between the bushes. It was like a little house. She knew nobody would find her there. Clutching the two envelopes in her hand, Sophie ran through the garden, crouched down on all fours, and wormed her way through the hedge. The den was almost high enough for her to stand upright, but today she sat down on a clump of gnarled roots. From there she could look out through tiny peepholes between the twigs and leaves. Although none of the holes was bigger than a small coin, she had a good view beginning. Oh, drat! She opened the two envelopes again. Who are you? Where does the world come from? What annoying questions! And anyway where did the letters come from? That was just as mysterious, almost. Who had jolted Sophie out of her everyday existence and suddenly brought her face to face with the great riddles of the universe? For the third time Sophie went to the mailbox. The mailman had just delivered the day's mail. Sophie fished out a bulky pile of junk mail, periodicals, and a couple of letters for her mother. There was also a postcard of a tropical beach. She turned the card over. It had a Nor-wegian stamp on it and was postmarked "UN Battalion." Could it be from Dad? But wasn't he in a completely different place? It wasn't his handwriting either. Sophie felt her pulse quicken a little as she saw who the postcard was addressed to: "Hilde Moller Knag, c/o Sophie Amundsen, 3 Clover Close ..." The rest of the address was correct. The card read: Dear Hilde, Happy 15th birthday! As I'm sure you'll understand, I want to give you a present that will help you grow. Forgive me for sending the card c/o Sophie. It was the easiest way. Love from Dad. Sophie raced back to the house and into the kitchen. Her mind was in a turmoil. Who was this "Hilde," whose fifteenth birthday was just a month before her own? Sophie got out the telephone book. There were a lot of people called Moller, and quite a few called Knag. But there was nobody in the entire directory called Moller Knag. She examined the mysterious card again. It certainly seemed genuine enough; it had a stamp and a postmark. Why would a father send a birthday card to Sophie's address when it was quite obviously intended to go somewhere else? What kind of father would cheat his own daughter of a birthday card by purposely sending it astray? How could it be "the easiest way"? And above all, how was she supposed to trace this Hilde person? So now Sophie had another problem to worry about. She tried to get her thoughts in order: This afternoon, in the space of two short hours, she had been presented with three problems. The first problem was who had put the two white envelopes in her mailbox. The second was the difficult questions these letters contained. The third problem was who Hilde Moller Knag could be, and why Sophie had been sent her birthday card. She was sure that the three problems were interconnected in some way. They had to be, because until today she had lived a perfectly ordinary life.察克莱因瓶，有一点似乎令人困惑－－克莱因瓶的瓶颈和瓶身是相交的，换句话说，瓶颈上的某些点和瓶壁上的某些点占据了三维空间中的同一个位置。我们可以把克莱因瓶放在四维空间中理解：克莱因瓶是一个在四维空间中才可能真正表现出来的曲面。如果我们一定要把它表现在我们生活的三维空间中，我们只好将就点，把它表现得似乎是自己和自己相交一样。克莱因瓶的瓶颈是广泛地应用到了建筑，艺术，工业生产中。三维空间里的克莱因瓶 拓扑学的定义编辑 克莱因瓶定义为正方形区域 [0,1]×[0,1] 模掉等价关系(0,y)~(1,y), 0≤y≤1 和 (x,0)~(1-x,1), 0≤x≤1。类似于 Mobius Band, 克莱因瓶不可定向。但 Mobius 带可嵌入 ，而克莱因瓶只能嵌入四维（或更高维）空间。莫比乌斯带编辑 把一条纸带的一段扭180°，再和另一端粘起来就得到一条莫比乌斯带的模型。这也是一个只有莫比乌斯带、一个面的曲面，但是和球面、轮胎面和克莱因瓶不同的是，它有边（注意，它只有一条边）。如果我们把两条莫比烈爆炸。一般认为质量小于9倍太阳质量左右的恒星，在经历引力坍缩的过程后是无法形成超新星的。[75] 在大质量恒星演化到晚期，内部不能产生新的能量，巨大的引力将整个星体迅速向中心坍缩，将中心物质都压成中子状态，形成中子星，而外层下坍的物质遇到这坚硬的“中子核”反弹引起爆炸。这就成为超新星爆发，质量更大时，中心更可形成黑洞。[76] 在超新星爆发的过程中所释放的能量，需要我们的太阳燃烧900亿年才能与之相当。[77] 超新星研究有着关乎人类自身命运的深层意义。如果一颗超新星爆发的位置非常接近地球，目前国际天文学界普遍认为此距离在100光年以内，它就能够对地球的生物圈产生明显的影响，这样的超新星被称为近地超新星。有研究认为，在地球历史上的奥陶纪大灭绝，就是一颗近地超新星引起的，这次灭绝导致当时地球近60%的海洋生物消失。[78]
克莱因瓶是一个不可定向的二维紧流形，而球面或轮胎面是可 克莱因瓶 克莱因
但是纽约州这2万多台呼吸机，中国只能先给提供2500台。
没办法，排队的人太多了。
看到纽约州求助中国成功了，
美国另一个州也宣布加入了“造反”的行列。
就在昨天，美国科罗拉多州州长波利斯宣布：
该州也正在与中国厂家接洽购买医疗物资。
波利斯愤怒地说，特朗普提供给我们的物资远远不够，
我们只能靠自己去购买医疗装备。
联邦政府不但不给我们提供医疗物资，
竟然还用标准来限制中国的物资供应美国，
我们管不了这么多了，
正在和中国洽谈N95口罩的进口事宜。
就在今天，美国的又一个州马萨诸塞州也造反了。
不顾特朗普的反对，决定在中国采购170万只的口罩，
经过多方协调和联络，终于达成了从中国进口120万只KN95口罩合约。
并在今天用一架私人飞机将120万只救急kN95口罩运回了美国。
这可都是晋级的救命口罩啊！
请记住Kn 95口罩，这是中国标准！
这个时候。很多美国政客们才回过味儿来了，
再跟着美国彭佩奥和中国死扛到底，
继续这样抗疫下去，只能有更多的美国无辜民众的死亡。
管你什么美国标准，欧洲标准，关键时刻救命才是真标准。
多年来，欧美国家一直对中国制造围堵打压，
用欧美标准把中国制造排除在欧美市场之外。
然而，经历了一场重大疫情的中国，
用效果来证明中国制造在重大疫情面前是能救命的。
在巨大的灾难来袭面前，
疫情将美国政客精心围堵中国的计划击的粉碎。
在美国疫情已经失控泛滥之下，
如果特朗普还是抱着围堵中国不放，
美国各州“造反”只是个开始，
等待特朗普政府的只能是更多的众叛亲离！
就在小编截稿时，收到最新消息，
由于美国医护物资紧缺严重，
加上各州擅自行动，让美国的禁令形同虚设，
美国疾控中心准备解除禁止从中国进口口罩的禁令，
在残酷的现实面前，美国终于要低下高傲的头颅了。
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