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1·I need to pay off all my debts before I leave the country.

我得在离开该国前偿清所有债务。《牛津词典》

2·It would take him the rest of his life to pay off that loan.

还清那笔贷款将花费他的余生。《柯林斯英汉双解大词典》

3·The firm will be able to pay off its debts and still turn a modest profit.

该公司将能够还清其债务，而且还会稍有赢利。《柯林斯英汉双解大词典》

4·You can't have it both ways. If you can afford to go out all the time, you can afford to pay off some of your debts.

你不可能做到两全其美。如果你有钱整天外出玩乐，就能还掉一部分债。《牛津词典》

5·The bottom line is that you need to study, eat a good meal, sleep well on the eve of the test, and believe that your efforts will pay off.

底线是你需要在考试前夕学习，吃好饭，睡好觉，并相信你的努力会得到回报。

6·But an investment is supposed to generate income to pay off the loans.

但是一项投资应该产生收益以偿还贷款。

7·Since he couldn't pay off his gambling money, he left university and began working for magazines.

由于无法还清赌债，他离开了大学，开始为杂志社工作。

8·We thought that even if we started educating girls today, we'd have to wait a generation for the pay off.

我们认为，即使我们今天开始教育女孩，我们也要等一代人的时间才能得到回报。

9·By selling the helium, the government can not only pay off that debt but reduce its overall debt as well.

政府通过出售氦不仅可以偿还债务，还可以减少总体债务。

10·If our findings persist, we may be faced with a financial crisis among elderly people who can't pay off their credit cards.

如果我们发现的这些情况一直持续下去，我们会看到老年人陷入财务危机，无法还清信用卡债务。

(1)payoff function支付函数