认真思考(sharpen up), 此释义来源于网络辞典。
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... sharp-edged 锋利的 sharpen up 使...更敏锐 sharpen 锐化 ...
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Sharpen Up The Knives 唱片名
Maybe sharpen up a stone 用文字让石头锋利
He needs to sharpen up before the Olympic trials.
在奥运会选拔赛之前，他需要进一步提高自己。
《牛津词典》
We need to sharpen up this knife.
我们需要打磨这把小刀。
youdao
Ginny tried to sharpen up some rusty typing skills.
金尼试图重拾生疏了的打字技术。
Sharpen up your public speaking skills, so that you can share your book with relevant audiences.
FORBES: 3 Things I Wish I'd Known About Writing a Book
The hard part of the tour is arriving, building up slowly and suddenly you have to sharpen up.
BBC: Strauss and Bell find timely form
Western Germany has been no star either, and several reforms have been introduced to sharpen up the economy.
ECONOMIST: Room for improvement
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