a blood / coffee stain

血渍/咖啡渍

White vinegar is great for removing stubborn stains.

白醋去除顽固污渍的效果很好。

a stain on sb’s reputation

某人名誉上的污点

a T-shirt stained with sweat

有汗渍的T恤

Be careful you don’t stain the carpet.

当心别把地毯弄脏了。

This tablecloth stains very easily.

这块桌布很容易脏。