I would regret it, because I would no longer see the friends I would meet, letters... letters that I wanted to write "One of this days".

我将深感遗憾，因为日后将见不到我的那些朋友，也不再有机会“在逝去日子里的某一天”给他们写信。

youdao

This introductory offer is for three days only.

本试销优惠只为期三天。

《牛津词典》

In the old days this used to be done with a baggage train of camels.

在古时候，这常常由一队拉行李的骆驼来完成。

《柯林斯英汉双解大词典》

Across this strange land, no man in the early days of the West knew just where death was waiting for him.

VOA: special.2010.03.25

This day is separated from all other days by additional rules and observances in keeping with its profound holiness.

这一天被附加的许多规则与其他日子完全区别开来,目的是保持它深厚的神圣性。

耶鲁公开课 - 旧约导论课程节选

you know, even in January and February sometimes we will get some really nice days like this

甚至在一二月份也会有好天气，

旧金山的天气 - SpeakingMax英语口语达人

That difference, 12 days this year versus 19 days last year, was commented upon by Doug Creutz of Cowen and Company in a note earlier this week.

FORBES: 'Call Of Duty: Black Ops 2' Sales Don't Point To Franchise's Decline

No one is going to try to do this 15 days a month.

WSJ: Pete Rose Works Full-Time Selling His Signature in Las Vegas

Despite the hard times he faced in this early days at Geico, Mr. Byrne was known for a humorous approach.

WSJ: Jack Byrne: The Man Who Saved Floundering Geico