我们感觉留存时间越长的东西，拥有的价值就越高。

We feel that the longer something lasts, the more value it has.

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二氧化碳被排放后，在大气层中的留存时间高达一个世纪，它能阻止热量从地球散发出去，从而导致气候变化。

Carbon dioxide stays in the atmosphere for up to a century after it is emitted, and has the effect of trapping heat on earth, causing climate change.

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这是一种如今公立学校缺失的教育，却仍然留存在许多私立学校—并且，要是你肯花时间学习如何学习，你和你的孩子也能享受到这种教育。

It was an education that is missing in public schools today but still exists in many private schools-and can for you and your children, too, if you take time to learn how to learn.

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