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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  cuts through some bonds, cuts through some atoms and so on.
  切到了一些化学键和原子
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  So here's the difference density map that appears on that slice.
  这个面上的电子密度分布是这样的
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  Now the colored atoms, in the right,
  右边带颜色的原子
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  are the positions of the atoms through which the plane slices,
  是刚好处在截面上的原子
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  but the atoms are subtracted out;
  不过原子是被减去了的
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  so what you see is the bonding in that plane.
  所以图上显示的就是化学键
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  So you see those bonds, because both ends of the bond
  因为键的两头都处在这个面上
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  are in the plane, so the bonds are in the plane,
  所以键也在这个面上
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  and you see just what you expect to see.
  这也和我们预期的一样
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  But there are other things you see as well.
  但图上还有些东西
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  You see the C-H bonds,although
  图上还有碳氢键
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  they don't have nearly as much electron density as the C-C bonds did.
  它们的电子密度不像碳碳键那么高