Why feathered dinosaurs eventually took to the air to become true birds is a mystery.

为什么带有羽翼的恐龙最后跃上蓝天变成了真正的鸟类，至今仍然是个迷。

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Why feathered dinosaurs eventually took to the air to become true birds is a mystery.

为什么带有羽翼的恐龙最后跃上蓝天变成了真正的鸟类，至今仍然是个迷。

youdao