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A bird never flew on one wing.

鸟从不单翼飞行。

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Bird

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One bird in the hand is better than two on the roof.

一只鸟在手胜过两只鸟在屋顶。

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Birds evolved from a small raptor like theropod.

鸟类是从像兽脚亚目食肉动物那样的小型猛禽进化而来的。

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