vt.为…复仇，为…报复
vi.报复，报仇
He promised to avenge his father's murder.
他发誓要报杀父之仇。
He vowed to himself to avenge his martyred comrade.
他暗暗发誓要为牺牲的同志报仇.
He swore to avenge himself on the mafia.
他发誓说要向黑手党报仇.
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