来自《耶鲁大学开放课程：金融理论 第10集 第10集》

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  because that way their risk is going down every year.
  因为这样他们的风险会下降
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  Every year the house is presumably still worth 120
  每年的房子大概是仍然值120
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  or whatever it was at the beginning
  或任一开始时的价值
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  and the amount owed is getting lower and lower.
  所欠金额越来越低
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  So the bankers are feeling more and more secure every year
  银行家们每一年就感觉更加安全
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  because the house is backing a smaller and smaller loan,
  因为房子由一个越来越低的贷款支持
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  or to put it another way,
  或者换另一种方式
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  if you're uncertain about what the price of the house will be in the future,
  如果你不确定的房子在未来的价格将
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  you want to make sure that what is owed is going down in the future.
  你要确保欠款在未来不断下降
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  If the price gradually goes down of the house what's owed is gradually going to go down.
  如果房价逐步下走 价格也会逐步下降
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  But the main reason why the number is so important is
  但是这个数字如此重要的主要原因就是
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  you have to realize the purpose of a mortgage is
  你必须认识到抵押贷款目的是