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1·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。《新英汉大辞典》

2·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。

3·This young man is as sharp as a razor. I am sure he will reach a high position in the company.

这个年轻人非常机灵。我相信他在公司会升到很高职位的。

4·A knife should be as sharp as a razor or it mashes and bruises food rather than chopping or cutting it.

厨刀就该像剃刀那么锋利，否则你就不是在切，而是在捣浆糊。