含義二者沒區別，在很多場合可以互相代替。見以下例子:
They disturb me at all hours of the day and night.:他們日夜不斷地打擾我。
I wish he'd desist from entertaining his friends at all hours of the day and night.:但願他別再晝夜不分地招待他的朋友。
She thinks she can call me at all hours of the day and night.:她以為她可以不分晝夜隨時給我打電話。
The sculptures will be engaging both during the day and night.:無論是白天還是夜晚，雕塑都將那麽迷人。
The enemy kept up their bombardment day and night.:敵軍壹直日夜不停地狂轟濫炸。
The bus service runs day and night.:公***汽車日夜都有班次。
We work in the day and rest at night.:我們白天工作晚上休息。
I don't want people playing the piano at all hours of the day and night.:我不需要人們白天黑夜時刻都彈鋼琴。
I do not want people playing the piano at all hours of the day and night .:我不需要人們白天黑夜時刻都彈鋼琴。
Give me a pain as please as you sad, so I can feel you all the day and night.:我要是有新的手繪發出來,妳也要給我加精華!
God gave us day and night, the night to rest in, and the day to see.:上帝給我們白晝與黑夜--黑夜是為了休憩安睡,白晝是為了明視萬物。
Mother nursed the baby day and night. 母親晝夜照料嬰兒。
I think Jerry Yang and Filo are probably not even tell the day and night.:楊致遠開始與網景討價還價，網景提出壹項建議：搜索引擎按字母順序排列。
She held the child in her arms day and night.:她日夜把孩子抱在懷裏。
News reporters camped upon his door step day and night.:壹些新聞記者日夜在他門口糾纏不走。
I had a stubborn cold and coughed day and night.:我得了很難治的感冒，日夜咳嗽。
I will sit by her bedside day and night.:我會日夜守在她的床邊。
They labored day and night in wretchedness.:他們在痛苦中夜以繼日地勞累。
They tailed the suspect day and night.:他們日夜追蹤嫌疑犯。
I wish he' d desist from entertaining his friends at all hours of the day and night.:但願他別再晝夜不分地招待他的朋友.