来自《耶鲁大学开放课程：新生有机化学 第4集 第4集》

• 
  
  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
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  and then with oxygen in the middle,
  然后把氧放中间
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  so we'll have done all possibilities there.
  那么我们就能写出所有可能的结构
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  So here are two possibilities.
  这里有两种可能
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  Now are these good structures is what we have to decide?
  我们要考虑这些是不是好的结构
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  Okay, now it would be possible to shift electrons here
  好 我们可以把电子移到这里
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  and draw a different Lewis structure.
  然后画一个不同的路易斯结构