One day I will return your help.

总有一天我会回报你的帮助。

youdao

One day I will get around to cleaning out my files.

终有一天，我会去清理我的文件夹的。

youdao

I thought, "One day I will write about it," and I did.

我那时想的是，“总有一天我要把这些写出来，”我做到了。

youdao

"Maybe one day I will,Batman.Purr-haps."

VOA: special.2009.06.07

I don't know what it takes to replicate that in China, but I certainly hope one day there will be a place in China that looks like Silicon Valley.

无法想象如何在中国复制一个硅谷，但我希望在将来,中国会有类似硅谷的地方。

斯坦福公开课 - 百度CEO李彦宏演讲：全球最大搜索引擎的发展课程节选

and then one day I'll be like, "Oh, I want to dress like a clown today, so I will."

而可能有时候，我想，“喔，今天我想打扮成一个小丑，然后我就这么做了。”

时尚让人兴奋 - SpeakingMax英语口语达人

God willing one day I will learn how my father died and bring him home.

FORBES: Murders and Pensions: The Need for Forensic Investigations (March 28, 2006 )

Since leaving the city I have wanted to return, and one day I will.

BBC: This is Seoul week

And every evening, he said to himself, One day I will ride to work as general manager of the hotel.

FORBES: Rebirth In Verona: The New Palazzo Victoria Hotel