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本文对妊娠的概念、生理、临床调查,认为通常的怀孕280天并非实际怀孕天数,预产期从末次月经算起只是一个时间界碑。
This article on the concept of pregnancy, physiology, clinical investigation, that the usual 280 days of pregnancy is not the actual number of days of pregnancy, the expected date of birth from the last menstruation is only a landmark.