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哺乳动物在体内孕育后代,这是一个物竞天择的完美结果。不管你信还是不信,这种尽善尽美的进化结果的出现,也许还得感谢一种病毒。
Mammals in the body give birth to offspring, this is a perfect result of natural selection. Whether you believe it or not, this perfect result of evolution may have to thank a virus.