身高三英尺、拥有巨喙的渡渡鸟已经成为了“动物灭绝”的标志。

The dodo, a three-foot-tall flightless bird with a great big beak, has become a symbol of extinction.

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对不同鸟类的观察越仔细，你对多种多样的鸟喙的了解就会更深入。

The more closely you begin to examine different birds, the more familiar you will become with the wide range of bills.

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某个性状的选择，比如说喙的大小或者其他别的，取决于控制该性状基因的代代传承。

Selection for a trait, be it beak size or something else, depends on passing down the genes for that trait to offspring.

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