来自《耶鲁大学开放课程：基础物理 第1集 第1集》

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  but that's how disturbing it is when people talk,
  但是在课上有人讲话确实很烦人
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  and very nice students who do not realize this
  有些好学生也没有意识到这点
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  often disrupt my line of thinking.
  他们经常会打断我的思路
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  So I ask you to keep that to a minimum.
  所以请你们尽量小声说话
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  Once in a while you'll have to talk to your neighbor and say,
  有时候你需要对你旁边的同学说
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  "Can you please pass me my pacemaker that fell down?"
  你能帮我捡一下我的心脏起搏器吗
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  That's fine.
  那是没问题的
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  Then you go back to your business.
  然后你要马上回到课堂上来
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  But don't do too much of that.
  但是说话不要太多
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  Finally, there is this ancient issue about sleeping in class.
  最后一点 就是上课睡觉这个古老的话题
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  Now, my view is, it's just fine.
  我觉得这没什么
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  I know you guys need the rest
  我知道你们需要休息