卵子

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生物教科书上是这样描述受孕过程的：男性一次会biu出几千万甚至上亿个小蝌蚪，它们要和彼此进行激烈的竞争，最终跑得最快的小蝌蚪将成功和卵子结合，完成使命，...

标签:卵子, 精子精液| 2023-04-23

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