1、work overtime 加班
例句：
If you ask your employees to work overtime, be there too.
如果你要求自己的雇员超时工作 那么你也留下来。
2、be aware of 知道，了解
例句：
But be aware of that distinction and that article.
现在得知道这个区别和这篇文章。
3、surplus 剩余，过剩
例句：
Western countries often dumped surplus goods into Third World countries.
西方国家常向第三世界国家倾销剩余货物。
4、labour force 劳动力
例句：
If discouraged workers have left the labour force because they could not find a job, then the unemployment rate may understate the hardship they face.
如果失去信心的工人因为找不到工作而离开劳动力大军，那么失业率可能低估了中国所要面临的困难。
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