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sharp as a tack
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释义
聪明的,脑子快的extremely clever or astute.
例句
Ross: Hi Amy!
Amy: You're not Rachel.
Ross: Still sharp as a tack!(Friends)
罗斯:嗨,艾米!
艾米:你不是瑞秋。
罗斯:脑子还是那么机灵啊!(老友记)