来自《耶鲁大学开放课程：金融理论 第9集 第9集》

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  And whatever the price of the 1-year bond is--actually,
  不论一年期债券的价格是多少
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  we know what that is.
  实际我们知道是多少
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  It's 100.1, that's how much it costs.
  它是100.1美元 这是它的价格
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  To buy 1 of them cost 100.1.
  花100.1美元来获得它的一份
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  To get 1 over 101 of them costs pi .
  为了得到它的1/101花费了π
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  Okay, so this number, by the way, is some number
  π的大小是
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  which, actually, I of course worked out here.
  我确实解出了它的大小
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  Happens to be .991, but we'll come back to that.
  它的值是.911 我们待会解释
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  So it happens to be point 991.
  所以它的值是.991
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  So now we know pi .
  所以我们现在知道了π的大小
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  Well, how would you buy 1 dollar in year 2?
  但你怎么在第二年买入一美元
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  So there's a way of directly buying 1 dollar in year 2,
  有一种直接的方法买入第二年的一美元