新动方在线-酷学资讯中心
2008-10-08 来源：中国国际广播电台网
It means to think carefully, use your intelligence
eg: If I make a mistake, I don't want him telling me to sharpen up.
Note:
Sharpen up的意思是认真思考，用用大脑
例：如果我犯了错误，我希望他别跟我说用用大脑。
2008年 11月 
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