Whatever the original purpose of feathers, they were probably around for millions of years before a single lineage of dinosaurs began to use them for flight.

不管羽毛进化的起初目的是什么，总之它们又经历了上千万年的时间才承载着某支恐龙谱系开始翱翔于蓝天。

youdao

Whatever the original purpose of feathers, they were probably around for millions of years before a single lineage of dinosaurs began to use them for flight.

不管羽毛进化的起初目的是什么，总之它们又经历了上千万年的时间才承载着某支恐龙谱系开始翱翔于蓝天。

youdao