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1·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》

2·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》

3·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》

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·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。

6·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。

7·Clearly, there are plenty of ways to keep track of your job search, and making the effort to simplify your job search will pay off.

显然，有很多方法可以跟踪你的求职情况，而且，努力简化你的求职过程将会是劳有所得的。

8·Clearly, there are plenty of ways to keeping track of your job search, and making the effort to simplify your job search will pay off.

显然，有很多方法可以跟踪你的求职情况，而且，努力简化你的求职过程将会是劳有所得的。

9·But in the long run, too much specialization doesn't pay off. Business, which has been flooded with MBAs, no longer considers the degree an automatic stamp of approval.

但从长远来看，过多的专业化并不会带来回报。商业界已经有了大量的工商管理学硕士（MBA），他们不再将学位视为一种能自动认可的标志。

10·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。

(1)payoff function支付函数