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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  But it's that one, the second one out along the branch.
  就是这里 在这条臂第二高的位置
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  Now, will that be-- -- do you expect that to be brighter
  你们觉得这个位置的光线会比前一个强
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  or not as bright as the first one?
  还是会更弱呢
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  Not-- -- well it probably will be not as bright,
  很可能比前一个弱
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  and the reason is that for-- --
  为什么呢
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  there are two things that have to do with the brightness.
  有两样东西与亮度有关
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  One is how much density there is on the planes
  一是某一平面上电子的密度
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  versus how much there is between the planes.
  二是平面间电子的密度
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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