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鲸的祖先是什么样子的？ - 知乎
source link: https://www.zhihu.com/question/24808308/answer/632233913
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现在小学生都知道鲸鱼是哺乳动物，不过这一常识直到18世纪才开始被人类所了解。到了19世纪，进化论的奠基…
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