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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  Or what else can happen,with a sulfur,
  硫化物还可以继续反应
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  what additionally can happen?
  还能怎么加
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  It could do another oxygen,
  还能再加一个氧
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  and give a sulfone, as it's called.
  生成砜
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  So Lewis explains this.
  路易斯的理论都能解释这些
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  So there are problems to drill on Lewis structures.
  关于路易斯结构 你们有些作业要做
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  They're on the Web, go look at them.
  已经挂在了网上 你们上网看
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  One of them is draw Lewis dot structures for HNC,
  其中一题是写出HNC的路易斯点式
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  in that order, H then N -- we did HCN;
  按HNC这个顺序 以前写的是HCN
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  but do HNC.
  现在写HNC
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  And then try HCNO with CNO in all six linear orders;
  HCNO要写出6个线性式
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  that is, nitrogen in the middle, carbon in the middle,
  也就分别是把N C放在中间