他在退休前担任了五年市长。

He served as mayor for five years before retiring.

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He served as mayor for five years before retiring.

served 是动词 serve 的过去式,serve 的基本意思是"服务、提供",在这里引申为"担任(某个职位)"。 serve as 表示"担任、作为",指在某职位上履行职责。

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