作为以下意思的时候可数：
[C]dirty mark or patch of colour caused by staining (stainv 1) 污点; 污斑; 污迹:There's an ink stain on your shirt.你的衬衫上有一个墨水斑.* I can't get these coffee stains out of the carpet.我弄不掉地毯上的咖啡污迹.[C] thing that causes disgrace (to a person's reputation,etc); moral blemish 玷污（某人名声等的）事物; 品德上的污点:He left the court without a stain on his character.他经法庭一役,人格丝毫无损.
作为以下意思的时候一般不可数,但有时也可数（比如最后一例句）
[U,C] liquid,etc used for staining wood,fabric,etc; dye 染色剂; 着色剂; 染料; 颜料:How much stain should I buy for the table?给这张桌子上色,我得买多少颜料?* a range of wood stains 木材着色剂系列.