ovum的英语例句
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Once the ovum is released it has a lifespan of 12 to 36 hours.
卵子排出后可存活12至36小时。
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By day 11 the ovum begins to attach and implant in the lining of the uterus.
到第11天卵子着床嵌入子宫内壁.
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One pc of germ cell approaches to a ovum quietly at first.
一个精子一马当先悄悄接近卵子.
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