two weeks' time为什么要有“ ’”two weeks'time two week's time two weeks time有什么不一样?哪一个是对的?

问题描述:

two weeks' time为什么要有“ ’”
two weeks'time two week's time two weeks time有什么不一样?哪一个是对的?

two weeks' time两周“的”时间
后两者是不对的