一日译练 | 什么是大宗商品？
一日一练 必成大大
责任编辑：小冰
小伙伴们大家好呀，今天是3月16日周一，也是我们公众号两位小编小可和小噶的生日，让我们一起祝愿她们生日快乐~
本周我们又要开启一个新的话题啦，就是【大宗商品】。上周，美股暴跌，迎来史无前例的两次熔断，国际原油价格也经历了暴跌。油价暴跌可能会影响到能源行业、石油化工业和交通运输业。国际大宗商品市场上，原油是最为重要的大宗商品之一。
那么什么是大宗商品？都有哪些特点？请点开今天的练习音频了解一下吧！~
事不宜迟
Let's get started!
生词提醒
E-C
futures contract 期货合约
ETF 交易型开放式指数基金/交易所交易基金
bushel蒲式耳（谷物和水果的容量单位）
liquidity 流动性
准备好就开始练习吧~
（向上滑动查看原文）
Commodities are the raw materials humans use to create a livable world. Humans use energy to sustain themselves, metals to build weapons and tools, and agricultural products to feed themselves. These — energy, metals, and agricultural products — are the three classes of commodities, and they are the essential building blocks of the global economy.
Commodities are most often used as inputs in the production of other goods or services. The quality of a given commodity may differ slightly, but it is essentially uniform across producers. The commodity has to be tradable, meaning there needs to be a viable investment vehicle to help you trade it. For example, a commodity is included if it has a futures contract assigned to it on one of the major exchanges, or if a company processes it, or if there’s an ETF that tracks it.
All the commodities have to be physically deliverable. Crude oil is included because it can be delivered in barrels, and wheat is included because it can be delivered by the bushel. Every commodity has an active market with buyers and sellers constantly transacting with each other. Liquidity is critical because it gives you the option of getting in and out of an investment without having to face the difficulty of trying to find a buyer or seller for your securities.
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