- have become specialized for aerial mastery.
如今已变成驾驭天空的专用工具 - And that's not the only change.
这还不只是唯一的变化 - Teeth have been replaced by beaks...
牙齿被喙取代 - ...that allow them to feed on new diets.
使其能够以新的食物为食 - But advances in feeding and flight alone
但仅靠进食与飞行上的进步 - were not enough to ensure the future of the birds.
并不足以确保鸟类有一个光明的未来 - They also drew on a rather flamboyant ancient behavior,
它们还依赖于 一种相当引人注目的古老行为
...that allow them to feed on new diets. 使其能够以新的食物为食
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