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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  You don't like to have that in your structures.
  这样的情形你并不喜欢
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  You like not to have charges if you can avoid it.
  如可避免 你希望它不带电
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  Obviously in BNH6 you can't avoid it.
  但这种情况在BNH6是没法避免的
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  Okay, now but you can get rid of the charge separation
  但现在HCNO上的电荷可以去掉
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  by shifting that electron pair
  可以将O上的一对电子
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  that's on oxygen to be shared between oxygen and nitrogen;
  拿出来在N与O之间共用
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  then you don't have the charge on oxygen anymore.
  这样O上就不带电荷了
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  Everybody see that?
  明白了吗
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  What's the problem when you do that?
  但这么做有什么问题呢
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  Nitrogen now has too many electrons.
  现在N上的电子太多了
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  So you could shift a pair from-- that's in the CN bond,
  能否把CN间的一对键电子
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  onto the carbon, in your drawing you make.
  转移到C上呢