I have a dream that one day we will all live in peace.

我的梦想是有一天，我们所有人都生活在和平之中。

youdao

My prayer is that one day he will walk again.

我的企盼就是有一天他能重新走路。

《牛津词典》

I just live in hope that one day she'll talk to me.

我只是希望有一天她会和我说话。

《柯林斯英汉双解大词典》

But I promised myself that one day I would punish Fortunato for his insults to me.

VOA: special.2009.02.07

for why you became afraid of dogs is that one day a dog came up and he was a neutral stimulus.

你之所以害怕狗,是因为，某天有只狗向你跑来,狗是一个中性刺激。

耶鲁公开课 - 心理学导论课程节选

but in that time, I'm hoping to set up my life such that one day, in the long term,

但长期以来，我希望有一天能够掌握自己的生活，

事业和人生都重要 - SpeakingMax英语口语达人

Another artist joked morbidly that one day Picasso would be found hanging behind "his giant canvas".

BBC: Too famous to see?

Growing up, I would make several weeks' worth of allowance on that one day.

WSJ: India Needs a Sexual Revolution

Most researchers agree that one day they will supplant embryonic stem cells in the lab.

FORBES: Scientists Relieved As Supreme Court Passes Over Case Against Embryonic Stem Cell Research