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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  And we see here that-- -- say take the original yellow one--
  之前这些黄色的平面上有很多电子
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  there's a lot; all this stuff is nearly on the plane,
  所有的电子几乎都能落在面上
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  and halfway between the plane there's not very much,
  而平面之间电子的密度却不大
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  just a thin cross-section of the wire.
  仅有小部分螺线落在了平面的间距中
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  But as the planes get closer and closer,
  但随着这些平面越靠越近
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  the fact that the wire has a finite thickness
  因为螺线具有的一定厚度
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  means that some parts of the wire, the same part of the wire,
  它上面某些部分散射出的光线
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  are out-of-phase compared to others.
  相较于其他部分 处在了异相
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  So because of the finite thickness you expect it
  因此 形成图像的位置越远
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  to slowly fall off in intensity as you go out;
  强度也就越弱
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  but you'll then get the third one along the branch and so on.
  但这条臂上仍然看得到第三条图像
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  And you can do the same trick in the other direction.
  在这条臂的另一个方向上也是如此