来自《耶鲁大学开放课程：新生有机化学 第4集 第4集》

• 
  
  That means it's 6/18 times
  这意味着在1毫升水中含有
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  10^23 molecules, in a cc of water.
  18分之6乘以10的23次方个水分子
• 
  
  Now that's a really, really big number
  这是一个非常非常大的数值
• 
  
  and it sounds like they must be just impossibly small,
  并且听起来水分子必须是难以置信的小
• 
  
  hopeless to try to see such a thing.
  我们几乎不可能看见它
• 
  
  But the difference is between the cube and the cube root,
  但差异在于立方和立方根
• 
  
  because when we measure distance
  因为当我们测量距离时
• 
  
  we measure linear, not volume.
  是测量直线不是体积
• 
  
  So to get something about
  所以当你得到关于距离的资料时
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  distances you take the cube root of the volume.
  你得到的是体积的立方根
• 
  
  So if we take the cube root of that,
  因此如果我们求其立方根
• 
  
  it's about three times 10^7.
  约是3乘以10的7次方