double agent
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释义
（为敌对双方服务的）双重间谍
A spy who pretends to work for one side, when they are actually working for or passing information to the other.
例句
Amy: By accepting the invitation, Bernadette becomes a double agent inside the enemy camp.(The Big Band Theory)
艾米：通过赴宴，伯纳黛特可以成为打入敌人内部的双面间谍。（生活大爆炸）
