This is the 3261st most frequent Chinese word.
十日
"Ten days" or "the tenth day."
In this sentence, "十日" means ten days, indicating a duration of time.
我的朋友在十日后返回家乡。
My friend will return to their hometown in ten days.
Here, "十日" is used to describe a completed period of ten days.
他已经工作了十日了，感觉非常疲惫。
He has been working for ten days and feels very tired.
In this instance, "十日" refers to the 10th day of the current month, specifying a date.