nights
The night is the part of each day when the sun has set and it is dark outside, especially the time when people are sleeping.
The fighting began in the late afternoon and continued all night.
那场战斗傍晚开始,持续了一整夜。
Finally night fell.
夜幕终于降临了。
The night is the period of time between the end of the afternoon and the time that you go to bed, especially the time when you relax before going to bed.
So whose party was it last night?
那么昨天晚上是谁办的聚会?
A particular night is a particular evening when a special event takes place, such as a show or a play.
The first night crowd packed the building.
首次夜场演出,全场爆满。
at night
If it is a particular time at night, it is during the time when it is dark and is before midnight.
It's eleven o'clock at night in Moscow.
现在莫斯科是晚上11点。
If something happens at night, it happens regularly during the evening or night.
He was going to college at night, in order to become an accountant.
他为了成为一名会计,每晚要去学院听课。
day and night , night and day
If something happens day and night or night and day, it happens all the time without stopping.
Dozens of doctors and nurses have been working day and night for weeks.
很多医生和护士已经夜以继日地工作好几周了。
an early night , a late night
If you have an early night, you go to bed early. If you have a late night, you go to bed late.
I've had a hell of a day, and all I want is an early night.
今天真是太糟糕了,我只想早早睡觉。