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。

youdao

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