BBC听力 | 冰雪世界 04

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First though valuable nesting places

来之不易的孵化地

must be defended from property thieves

最重要的是要防止窃贼

After laying their eggs

下完蛋之后

take time out to clean their plumage the petrels

会抽出时间把羽毛清理干净

The south polar skua is a formidable opportunist

灰贼鸥是一种强大的投机分子

but the skuas have not chanced upon the petrels

但贼鸥对雪鹱从不主动出击

they've been waiting for them

而是等待它们的到来

These birds do not need to go to the ocean for their food

它们不需要费力地到海洋里去寻找食物了

The skuas can survive further south than any other predator

贼鸥可以比其他肉食动物生存到更南边

by exploiting the petrels' desperate need for bare rock

通过利用雪鹱极度渴望的裸露的岩石

Even at the height of summer

即使是在盛夏

less than 3% of Antarctica is free of ice

南极也只有不到百分之三的地方没有冰雪覆盖

and nearly all of that exposed rock

而且几乎所有露出的地面

is found in one place - the Antarctic Peninsula

只集中在一个地方——南极半岛

Its long arm extends further north than the rest of the continent

这块地方像一只向温带伸出的长臂

so spring arrives here first

所以这里的春天来得最早

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