1.弄臟，染污 (with); 沾污，玷污(名譽等)。
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- These stains wo n't come off , i am afraid .
- We papered over the stains on the wall .
- I rubbed hard but the stain just would not go .
- The incident stained his career .
- Stain of the sediment reveals numerous bacteria .
- an act that brings discredit to the person who does it; "he made a huge blot on his copybook"
同義詞：blot, smear, smirch, spot
- a soiled or discolored appearance; "the wine left a dark stain"
- a symbol of disgrace or infamy; "And the Lord set a mark upon Cain"--Genesis
同義詞：mark, stigma, brand
- the state of being covered with unclean things
同義詞：dirt, filth, grime, soil, grease, grunge
- (microscopy) a dye or other coloring material that is used in microscopy to make structures visible
- color for microscopic study; "The laboratory worker dyed the specimen"
- color with a liquid dye or tint; "Stain this table a beautiful walnut color"; "people knew how to stain glass a beautiful blue in the middle ages"
- produce or leave stains; "Red wine stains the table cloth"
- make dirty or spotty, as by exposure to air; also used metaphorically; "The silver was tarnished by the long exposure to the air"; "Her reputation was sullied after the affair with a married man"
同義詞：tarnish, maculate, sully, defile
A stain is a discoloration that can be clearly distinguished from the surface, material, or medium it is found upon. They are caused by the chemical or physical interaction of two dissimilar materials.