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1·He burst into tears, begging her to forgive him and swearing to pay back everything he had stolen.

他突然哭了起来，求她原谅他并发誓要偿还他偷的所有东西。《柯林斯英汉双解大词典》

2·Why not work out some system whereby they can pay back the debts they owe society instead of incurring another debt by going to prison and, of course, coming under the influence of hardened criminals.

为什么不制定一些制度让他们偿还欠社会的债务，而是送他们去坐牢，由此产生另外的债务，并受到惯犯的影响。

3·You can pay back the loan over a period of three years.

你可以在三年内分期归还贷款。《牛津词典》

4·He couldn't reasonably be expected to pay back the loan all at once.

公平合理地讲，不可能指望他一下子归还全部借款。《牛津词典》

5·Many people think that saving food is the best way to pay back his super achievement.

许多人认为，节约粮食是回报他伟大成就的最好方式。

6·However, after she told her boss what had happened, to her surprise, the boss didn't ask her to pay back the money.

然而，让她吃惊的是，当她把事情的经过告诉老板后，老板并没有要求她还钱。

7·It says on your website that your company will pay back the money within three working days of you receiving the returned item, but it's been five working days and I haven't received anything.

你们网站上说，你们公司会在收到退货后的三个工作日内把钱还给我，但现在已经过了五个工作日，我还没有收到任何退款。

8·Never pay back evil with evil.

不要以恶报恶。

9·He did that to pay back society.

他那样做是为了回报社会。

10·She concluded she would pay back the exact amount on Saturday.

她决定在星期六如数偿还。

(1)payback period回收期；偿还期

(1)payback period of investment投资回收期