We need to sharpen up this knife.
我们需要打磨这把小刀。
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。
For Mr Obama, the lesson is simple enough: sharpen up, and prepare for a tough two years.
对奥巴马而言，教训简单不过：改善自身，迎接今后两年的艰巨考验。
Ginny tried to sharpen up some rusty typing skills.
金尼试图重拾生疏了的打字技术。
It's not a good reputation and if we want to improve our image we need to sharpen up a bit.
这可不是什么好名声。要是我们想改变形象就必须要努力了。
It's not a good reputation and if we want to improve our image we need to sharpen up a bit.
这可不是什么好名声。要是我们想改变形象就必须要努力了。
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