来自《耶鲁大学开放课程：新生有机化学 第2集 第2集》

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  Suppose you had a chain of atoms,
  假设你手里拿着一串原子
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  a thread that was single atoms bonded to one another,
  这些原子被一根线穿起来
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  and you started stretching it.
  然后你用力拉扯这根线
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  It would stretch, and at some point it would pop.
  这根线会越拉越长 直到绷断
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  Now let's just take three of the atoms
  就拿这三个原子来举例
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  and we'll put stiff rods on the outer ones
  最外边的两个原子连上棍子
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  and we'll start stretching it.
  然后我们将棍子向两边拉
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  So it'll stretch, stretch, stretch,stretch,
  越拉越长越拉越长越拉越长越拉越长
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  pop.
  砰 拉断了
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  Now the question is how far do you stretch it before it pops?
  现在的问题是 得拉多长线才会绷断呢
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  What determines how far you stretch it before it pops?
  是什么决定我们得拉多长呢
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  Okay, this must have to do with the force law between atoms,
  这就和原子间的引力定律有关了