五天用英语怎么说

"Five days" can be translated as "five days" in English.
The English word "five" comes from the Old English "fīf", and "days" comes from the Old English "dæġ".
Example sentences in English:
I'll be back in five days.
It takes five days to complete the project.
Example translations in Chinese:
我五天后回来。
完成这个项目需要五天时间。