two years and a half 还是two year and a halfyear后没有没有s啊?

问题描述:

two years and a half 还是two year and a half
year后没有没有s啊?

都应该加s,但如果是two-year,year后就不可以加s.

two years and a half = two and a half years 两年半(因为TWO‘二’大于1,故后面的名词要加S,比较:one year and a half = one and a half years 一年半