他的言行举止在军队里变得越来越粗俗。

His manners coarsened during his time in the military.

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His manners coarsened during his time in the military.

coarsened 是动词 coarsen 的过去式,coarsen 由形容词 coarse(粗糙的、粗俗的)加上动词后缀 -en 构成,意思是"使变得粗俗或粗糙"。在句中表示"变得粗俗"的变化过程。

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