为什么鲸鱼海豚等海洋类哺乳动物的尾鳍是横�的，而大部分鱼类的尾鳍是纵�的？知乎 Sketch Coloring Page

为什么鲸鱼海豚等海洋类哺乳动物的尾鳍是横�的，而大部分鱼类的尾鳍是纵�的？知乎 Template

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