来自《耶鲁大学开放课程：新生有机化学 第4集 第4集》

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  I think you remember that.
  我想你应该没忘
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  Okay, so let's just look at it.
  好吧 那么我们就看一下
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  So what we're going to do is
  那么我们要做的是
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  compare what we see with Lewis theory with things
  比较一下我们用路易斯理论得到的
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  that have been calculated by reasonably good quantum mechanics;
  和用量子力学计算得到的
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  not the very, very highest level, but a pretty good level.
  不是最最高阶的量子力学 不过已经够了
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  Okay, so we want to try
  好吧 那么我们要试试
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  to make all the possible arrangements here.
  所有的排列
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  So we can put the three atoms, O, C, N,
  所以我们可以把OCN任意一个
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  with any one of them in the middle,
  放到中间
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  and then we can put hydrogen on either end.
  然后我们可以把氢原子放到任意一端
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  So then we'll do it with nitrogen in the middle
  那么我们要从氮在中间的开始