4周搞定2000+托福核心词
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常考释义
The main source of energy that most of them use is still coal, and when it's burned it releases mercury into the atmosphere.
The main source of energy that most of them use is still coal, and when it's burned it releases mercury into the atmosphere.
来源于:剑雅12-TEST7n. (困难的)根源,原因
n. (河流的)源头
n. 来源;产地
n. 消息来源;消息人士;(论文中引文的)出处,原始资料
v. 寻找(产品或原料的)货源
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