Self-amortizing means that you're not just paying the interest every year -or every month--you're paying interest plus principal.

分期偿还是指,每年或者每个月,你不仅偿还利息,还要偿还利息加上部分本金

耶鲁公开课 - 金融市场课程节选

We have to add it all up so it's not just numbers, three against one; it's also all of those people at home.

得把这些加起来考虑,所以就不只是这个数字，三比一;,还要加上这三人的家人。

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Then you want to add the present value of the principal and that's the formula.

最后还要加上债券面值的现值,这就是债券定价公式

耶鲁公开课 - 金融市场课程节选