two-week two weeks 的区别

two weeks=两个礼拜

two-week = 两个礼拜（长）的X

比如，

"He is in Shanghai for two weeks." (他会在上海呆两个礼拜）。

"He is in Shanghai for a two-week English course." （他在上海参加一个为期两个礼拜的英语课程）。