来自《耶鲁大学开放课程：基础物理 第1集 第1集》

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  between your level of thinking
  和到黑板的距离之间
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  and the proximity to the blackboard.
  绝对存在某种反比关系
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  So if you find me making a mistake,
  所以你发现我写错了
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  you've got to stop me.
  一定得让我停下来
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  Why do you stop me? For two reasons.
  为什么要让我停下来呢 两个原因
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  First of all, I'm very pleased when this happens,
  首先 我非常乐意你们指出我的错误
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  because I'm pretty confident that I can do this under duress,
  因为虽然我对这些公式了如指掌
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  but I may not do it right every time.
  但我并不能保证每次都写对
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  But if my students can catch me making a mistake,
  如果我的学生能发现我犯的错误
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  it means they are following it
  这证明你们确实在听课
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  and they are not hesitating to tell me.
  并且愿意直言不讳
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  Secondly, as we go to the more advanced part of the course,
  其次 随着我们课程的深入