Under both types of loan, the principal sum immediately reduces every time a loan instalment is made.

在这两类贷款中，每一次缴付贷款分期付款，本金数额将会随之减少。

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Ratio of Annual Debt Service to original principal of the loan. Also known as a mortgage constant.

原贷款本金每年的借债服务比率。亦称房屋贷款常数。

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Because the principal amount of a reverse mortgage cannot be determined until after you no longer live at the property, neither can the maturity date of the loan.

因为本金逆按揭无法确定后才不再住在你的财产，也不能对贷款到期日。

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For example, the government, as a condition of bearing part or all of the cost of reducing the principal on a given loan, might have insisted on receiving some share of the future appreciation in the value of the property in question, perhaps by issuing a second mortgage that had to be paid off upon a sale.

NEWYORKER: Replay

Issued during a period of historically low interest rates--for adjustable-rate mortgages, they clocked in below 4% in 2003--many mortgages allowed buyers to pay only the interest on a loan for a certain period of time, or pay down very little on loan principal.

FORBES: Surviving The Mortgage Mess

One advantage of bonds to the borrower is that a bank will usually require payments on the principal of the loan in addition to the interest, so that the loan gradually gets paid off.

FORBES: Might Be A Great Time To Be A Bond Bear