PREFIX （加在名词前）表示“以前的”，“前任的” ex- is added to nouns to show that someone or something is no longer the thing referred to by that noun. For example, a woman's ex-husband is no longer her husband. （加在名词前）表示“以前的”，“前任的”
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...my ex-wife.
我的前妻
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...ex-President Reagan.
前任总统里根
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...an ex-soldier.
退役士兵