The fellow is as sharp as a razor. Be careful in your dealings with him.

这家伙厉害得很, 你和他打交道时要特别小心.

《现代汉英综合大词典》

They have pushed themselves to be as sharp as a razor's edge.

他们已经把自己磨砺得像刀尖一样锋利.

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I cut myself on a piece of plastic that was as sharp as a razor.

我在一块极锋利的塑料片上划了一下.

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