我的企盼就是有一天他能重新走路。

My prayer is that one day he will walk again.

《牛津词典》

有一天他离开了，消失得无影无踪。

One day he left, disappeared without a trace.

《柯林斯英汉双解大词典》

有一天他突然离开了。

One day he just upped and left.

《柯林斯英汉双解大词典》

She represents a power that might enable Milton perhaps someday actually to fulfill, to consummate his much-anticipated poetic promise.

她象征着一种力量,也许有一天那力量可以，使弥尔顿圆满完成他那备受期待的理想诺言。

耶鲁公开课 - 弥尔顿课程节选

And even more scary than that, a friend of mine is married, and his wife was walking to church one morning.

更可怕的是，我的一个已经结了婚的朋友，有一天早上当他老婆正往教堂走时，

在上西区 - SpeakingMax英语口语达人

You remember that Milton had vowed to his friend Charles Diodati in the Sixth Elegy that he would become an epic poet some day, and that he was taking all of the necessary steps to transform himself into an epic poet.

弥尔顿曾在第六挽歌中向他的朋友查尔斯，迪奥达蒂宣布,他有一天将成为一名史诗诗人，他也在不断努力,把自己变为一名史诗诗人。

耶鲁公开课 - 弥尔顿课程节选