文本来源：佛山商务英语培训 首选爱德华国际英语

白天=daytime，夜晚≠nighttime

可以看出，英语是一种不合逻辑的语言。
Daytime（白天）是一个词:night-time或night time（夜晚）则不是一个词。需要加连字符或者空格。

例句：
During the daytime he has to work and at night he must take care of their children.
他白天需要工作，晚上还要照顾孩子。
The government announced a night-time curfew.
政府宣布实行宵禁。

很多时候还可以不加“time”

例句：
During the day he has to work.
他白天需要工作。

These days everyone is working both day and night to finish the job on time.
这几天大家都在日以继夜地忙着完成任务。

文本来源：佛山商务英语培训 首选爱德华国际英语