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1.such as 例如
例句：Heroes such as Huang Jiguang will always live in the hearts of the people.
像黄继光这样的英雄人物， 将永远活在人民的心里。
2.global warming 全球变暖
例句：The threat of global warming will eventually force the U.S. to slow down its energy consumption.
全球变暖的威胁将最终迫使美国减慢其能源消耗。
3.tell from 辨别
例句：Can you tell an ox from a cow?
你分得出公牛和母牛吗?
4.be able to 能够
例句：We want a man who must be able to cost.
我们需要一个能计算成本的人。
