来自《耶鲁大学开放课程：金融理论 第2集 第2集》

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  but in fact it turns out I'm going to spend another class
  事实上我准备在这节课之后
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  after this talking about this.
  用另一节课来谈这个事情
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  There's not that much complication to get all those things in.
  把这些元素都加进来没那么复杂
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  There'll be two more classes about this.
  用两节课来讲它
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  So I'm recapitulating all that you have to know for the
  我将初级和中级经济学中
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  purposes of this class from introductory economics and intermediate economics.
  会在我们课上用到的东西总结了一下
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  So anything you have to know,
  你需要知道的
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  you will hear these two classes
  你会听这两节课
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  and some of you will find it's incomprehensible,
  你们其中一些会发现很难理解
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  and so that's one good reason for doing it now.
  这是一个现在讲它的好理由
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  You find out right at the beginning whether it's too complicated to bother with.
  你们一开始就能知道这是不是太难学
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  So anyway, I'm going to keep going now to extend the model.
  因此我现在要开始不断拓展这个模型了