尽管人们已经知道全球变暖很久了，但却迟迟不做出行动。

Although we've known about global warming (全球变暖) for a long time, people have been slow to respond to it.

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人们已经知道很久以前人类是什么样子的。

People have known what man was like many years ago.

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举例来说，线程存在很多年来人们已经知道的脆弱性。

Threading, for example, has frailties that have been known for many years.

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We've known since antiquity that you could take gold, and you can hammer to very, very thin foil.

我们已经知道很久以前，人们就能用锤子把金敲成非常非常薄的箔片。

麻省理工公开课 - 固态化学导论课程节选