Today, machines can walk and swim fairly well but can neither fly like birds nor think like humans.

如今，机器可以很好地走路，游泳，但是不能像鸟一样飞，也不能像人一样想。

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Men have always wanted to fly like birds. Birds can fly easily because they are light, but men's bodies are heavier.

人类总想像鸟儿一样地飞行。鸟儿能够轻易地飞行是因为它们的身体轻，但是人类的躯体可就重多了。

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Birds prefer not to take any chances—and to steer clear of all insects that look, sound, or fly like a bumblebee to avoid being stung.

鸟类宁愿不去尝试更多的机会——它们要避开所有如大黄蜂的长相、声音和飞行模式的昆虫，以避免被蛰。

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Indeed, tomorrow's planes could perhaps fly in formation, "like migrating birds", Airbus predicts.

BBC: Sowing the seeds of tomorrow's aircraft