I promise to return the book to you as soon as I finish reading it.

我承诺一读完这本书我就把它还给你。

youdao

I made a solemn promise that I would return.

我郑重承诺我会回来的。

《牛津词典》

Offsetting the high risk the investor takes is the promise of high return on the investment.

投资者因承担了高风险因而可以获得高额的回报。

youdao

In return,he had to promise that the mail would travel from Saint Louis,Missouri, to San Francisco,California, in twenty-five days or less.

VOA: special.2010.04.26

He told Grant that his men would promise to stay out of the war if permitted to return to their homes.

VOA: special.2009.11.19

However,the people of the Philippines built a statue to honor him for keeping his promise to return.

VOA: special.2009.05.24

So perhaps it would be advantageous to allow in a mining firm which could then in return promise to do regeneration work.

BBC: Business presence fuels summit tempers

They offer free delivery and free return and promise you will get your shoes in 4 days although they love to amaze you by delivering them faster.

FORBES: Cult Brands: Weathering the Storm

People have accepted lower wages over the years in return for the promise of a secure retirement.

CNN: Clinton's September 17, 2007, speech on health care