来自《耶鲁大学开放课程：基础物理 第4集 第4集》

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  So, I'm applying a force F.
  我施加一个力 F
• 
  
  Let me give it some other name, f.
  我还是给它换一个符号吧 f
• 
  
  No, that's also bad,
  这也不好
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  f was the name for friction.
  f 是摩擦力的符号
• 
  
  So, I'm going to apply a force called Fme.
  所以我要施加这个力叫做 Fme
• 
  
  You can label these things any way you like.
  你可以随便用什么符号来标记它们
• 
  
  This particular notation has not caught on
  这个特殊的命名没有流行起来
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  because people are not as interested in what I think as I am.
  是因为大家不会对我的想法太感兴趣
• 
  
  But right now I'm going to call it Fme.
  但现在我还是把它叫做 Fme
• 
  
  I invite you to invent any notation you want
  我推荐你们创建自己喜欢的命名
• 
  
  because there's nothing sacred about a notation,
  因为不用对命名有什么顾忌
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  at least I want to convey to you that notion.
  至少我想让你们明白这一点