剃须刀在英语中被称作 razor。它来源于拉丁语razor，意思是“刮胡刀”。例句如下：

He used a razor to shave his beard.（他用剃须刀刮胡子。）

The razor cut his skin while he was shaving.（他刮胡子时剃须刀割伤了他的皮肤。）

She bought a new razor because the old one was dull.（她买了一把新的剃须刀，因为旧的已经钝了。）