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事实

氧气来自哪里？

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amazing science facts
事实

您可能不知道的15个令人难以置信的科学事实

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头三个月

怀孕4周 – 胎盘和胚胎开始形成

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2 weeks pregnancy egg sperm trying to conceive ovulation
头三个月

怀孕2周 – 症状和期待什么

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1 week pregnancy sperm egg fecundation
头三个月

怀孕1周 – 症状和期待什么

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Why do books smell so good lignin cellulose
事实

为什么书闻起来那么好？

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孕晚期

怀孕28周 – 婴儿的梦想是什么？

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