来自《耶鲁大学开放课程：新生有机化学 第6集 第6集》

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  or whatever the number is, and so on.
  等等等等
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  And what you do is take a felt tip pen
  你需要用笔
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  and connect dots of equal size,
  把数值相等的点连接起来
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  and you'd get a contour of that particular electron density.
  就可以得到电子密度轮廓线
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  And here's where that was done for a particular compound.
  这里显示就是由某化合物得到的地图
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  This is taken from a book written at that time by Stout and Jensen.
  引自斯托特和吉森当时出版的一本专著
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  And you drew these by hands
  当时需要手绘
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  because you didn't have a computer that could draw--
  因为那时的电脑
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  that could figure out where to draw it and so on.
  还没有这种功能
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  So here were atoms in a particular crystal structure.
  这显示的是某晶体中的原子
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  Then you had a whole bunch of sheets of paper for different slices,
  不同断层的信息 反映在不同的纸上
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  through the electron density; stack them up.
  把这些纸叠起来 就得到全貌