来自《耶鲁大学开放课程：金融理论 第1集 第1集》

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  derivative of that which is 3-8x.
  你应该能解出它的导数是3-8x
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  If you've got the log natural of x
  你也应该知道如何对
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  you have to take the derivative.
  自然数进行求导
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  It's one over x.
  等于x分之一
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  If you've got 3x 5=10 and 2x-7=12
  如果你拿到3x 5=10和 2x-7=12
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  you have to be able to solve that simultaneous equation.
  你得会解方程组
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  So that's the kind of thing you have to do,
  你们要做的大概就这些
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  and you have to be able to do it quickly
  不过你们得做得又快
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  and with total confidence that you're doing it right.
  而且相信自己得出的结果是正确的
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  And for many of you that's no problem,
  对于大多数人来说没问题
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  but for some of you
  但是对于
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  who are maybe even smarter than everybody else that's a problem,
  更聪明一点的也许个问题