来自《耶鲁大学开放课程：新生有机化学 第5集 第5集》

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  And now you can see what pattern there is
  从这样的远处的观察会发现一个规律
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  for high points and low points, for waves.
  波峰和波谷的形成规律
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  Because you can see here that there's a pattern like that,
  在这里 你们可以看到波峰
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  that goes along the maxima.
  是呈这样一个模式分布的
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  Everybody see that?
  看到了吗
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  And halfway in between those dashed yellow lines,
  而在这些黄色短线之间
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  there's no change at all; nothing's happening there.
  却没有波 什么都没有
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  And if you go out very, very far away,
  从很远的地方看
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  you can see that asymptotically these approach
  将这些位置用线连起来
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  these straight lines that originate between the electrons,
  会发现连线会在在两电子中间汇合
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  or on the crystal in a real case.
  实际情况中 就是晶体的位置
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  So what you have coming out of the crystal are straight rays of light, x-ray light.
  而从晶体位置发出的这些连线就是X光