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N-COUNT
歹徒;惡棍;流氓
A villain is someone who deliberately harms other people or breaks the law in order to get what he or she wants.
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N-COUNT
（小說、電影或戲劇中的）主要反面人物，反派主角
The villain in a novel, film, or play is the main bad character.
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PHRASE
元兇;禍首;為害的人
If you say that someone is the villain of the piece, you are saying in a slightly humorous way that they are seen by some people as the cause of all the trouble in a particular situation.
例句
If Mr Denny is indeed the villain of the piece, as the police claim he is, he should have been more carefully watched.
如果丹尼先生真像警察說的那樣是犯罪元兇，就應該對其進行更加嚴密的監視。