black sheep
noun [ S ] uk/ˌblæk ˈʃiːp/ us/ˌblæk ˈʃiːp/
败类,害群之马;有辱门楣的人
a person who has done something bad that brings embarrassment or shame to his or her family
He's the black sheep of the family. 他是这个家族中的败类。
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