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为什么鸟类作为恐龙的后代，生物学上被分为独立的“鸟纲”而不是蜥形纲蜥臀目下的“鸟亚目”？ 知乎 Template






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sketch 4682 Elvis Presley by Nassim Nouri
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sketch 5156 Angry Bird by Roberto Castro Colimil
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