七日

七日

"Seven days" or "a week."

In this sentence, "七日" (seven days) is used to express a duration of time until an event occurs.

书店的新书需要七日才能送到。

The new book from the bookstore takes seven days to arrive.

Here, "七日" is utilized in a definition context to state the equivalence of seven days to one week.

七日是一个星期的长度。

Seven days is the length of a week.

In this sentence, "七日" represents the total period allocated for an occasion, in this case, a vacation.

她的假期只有七日，很短。

Her vacation is only seven days long, which is rather short.