来自《耶鲁大学开放课程：新生有机化学 第7集 第7集》

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  for keeping track of valence,
  对找出化学键和标出价数非常好用
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  but they're hopelessly crude
  但它们也及其粗线条
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  when it comes to describing the actual electron distribution,
  想要描述实验得到的真实电子的分布
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  which you can see experimentally here.
  它们就太原始了
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  There is electron sharing.
  电子确实被共用
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  There's a distortion of the spheres of electron density
  电子密度的球状分布即原子确实变形了
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  that are the atoms, but it's only about
  但实验得到的这样的情况
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  5% as big as Lewis would've predicted,
  只占路易斯所预测的数量的5%
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  had he predicted that two electrons would be right between.
  他预测共用的两个电子在两原子正中
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  And there are unshared pairs, as Lewis predicted.
  路易斯也预测到了未共用电子对
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  And again they're less -- but in this case they're even less
  但实际的数量 在这个例子里
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  than 5% of what Lewis would've predicted.
  只占他所预测的5%还不到