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怀孕一般多少天生
更新时间: 2020-11-05 00:00:00  

医学上的怀孕时间从末次月经的第一天开始算,总共280天到预产期。

怀孕,指哺乳类雌性(包括人类)在体内有一个或多个胎儿或胚胎。人类的妊娠是哺乳动物中研究的最详细的。

关键词: 怀孕 一般 多少 天生

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