我母亲怀孕时戒烟了。

My mother stopped smoking when she became pregnant.

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My mother stopped smoking when she became pregnant.

pregnant 是形容词,由前缀 pre-(表示"在...之前")和词根 -gnant(来自拉丁语,与"出生"相关)组成,字面意思是"在出生之前的",即"怀孕的"。

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