verb · to examine or scrutinize carefully

这件古玩的真伪，请行家一鉴便知。

verb · a bronze mirror used in ancient times

古人常以青铜为鉴。

punctuation · something that serves as a warning or a lesson

我们应该引以为鉴，避免犯同样的错误。

expression · to reflect or mirror an image

地上的积水清澈见底，光可鉴人。