Usually when you have a mortgage loan in the United States, or a car loan, you are giving the bank part of the principal back each time you send in money, but you are also giving them part of the interest.

通常，当你在美国有抵押贷款或汽车贷款时，每次汇款时， 你都在向银行返还部分本金， 但同时也给银行部分利息。