来自《耶鲁大学开放课程：新生有机化学 第4集 第4集》

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  So it's not impossibly small,
  所以不是难以想象的小
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  it's just very, very small.
  只是非常非常小
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  In fact, a nucleus is 10 femtometers,
  事实上 原子核是10飞米
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  which is another 10^5 down.
  这是再小10的5次方
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  So that means if the lecture room were an atom,
  这就意味着这间演讲室是一个原子
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  the nucleus would be the diameter of a hair;
  原子核是一根头发的直径
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  very small, but not impossibly small to conceive of. Okay?
  非常小 但是并不是不可思议的小
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  Now Newton, in Opticks, the book we looked at before,
  牛顿在光学一书中 我们之前提过这书
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  in 1717 wrote on page 369:
  第369页于1717年写道
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  "The thickness of the Plate where it appears very black,
  一块不透光板的厚度是
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  is three eights of the ten hundred thousandth part of an Inch."
  百万分之一英寸的八分之三
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  "Is" - that means he knew the size of it.
  是表明他知道它的大小