We're going to spend three days in the country.为什么three days前面没有for?

问题描述:

We're going to spend three days in the country.为什么three days前面没有for?
是spend出现,后面原先需要介词的短语都不用加介词了吗?

我们将在这个国家呆上三天时间.
spend作及物动词,后面加钱,时间,精力,表示"花费,花销"
如果一定要用for,则可以这样:
We're going to stay in the country for three days.