Troops patrolled the border day and night.

军队日夜在边境地区巡逻。

《牛津词典》

In theory I'm on call day and night.

理论上，我不分昼夜随叫随到。

《柯林斯英汉双解大词典》

The enemy kept up the bombardment day and night.

敌人昼夜不停地狂轰滥炸。

《牛津词典》

in the day and in the night-time, sometimes moonlight, sometimes storms, and we a-floating along, talking and singing and laughing.

VOA: special.2010.03.21

"I felt guilty day and night - what I was doing was not right.

VOA: special.2009.01.03

But the number of deaths in the two groups whose day-and-night cycles had been tampered with was far higher.

ECONOMIST: Biology: Go west, old man | The

Accordingly, in respect of urgent disaster relief and reconstruction, the sterile day-and-night tactically political maneuvering between political parties must be replaced by a new effective supra-party organization framework.

FORBES: Beginning of "Post-Post-WWII" History?

It's been a day - and a night - of contrasts at Lashkar Gah.

BBC: Newsbeat - The P Word - Reflecting on a week in Afghanistan