鸟能越飞越高。

Bird can fly higher and higher.

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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.

youdao

这样一来不难发现，雄性鸟的羽毛随着一代代演变，毛色长得越来越美丽出众。

With this criterion, it's not surprising that male plumage would grow more and more elaborate over the generations.

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