来自《耶鲁大学开放课程：基础物理 第16集 第16集》

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  and certainly in engineering and mathematical physics.
  在工程和数学物理中也是一样
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  I'm going to now change gears,
  我现在要换个话题
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  but I want to stop a little bit
  但我想稍停一下
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  and answer any questions any of you have.
  来回答你们的问题
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  So, how many people have seen all of this before?
  有多少人曾经学过这些
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  So, if you saw something, you saw the whole thing.
  如果你学过一部分 那你一定全学过
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  But look, that's not such a big number,
  但我注意到这样的人数并不多
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  so I am cognizant of the fact
  我现在了解了
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  that not many of you have seen it.
  你们中许多人没有学过这些
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  But you will have to go and learn this today.
  但现在你必须把它学会
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  I'm going to post the problem set for this
  我要分发这一部分的习题
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  sometime in the day so you can start practicing.
  就在今天 然后你们就可以开始练习了