问题描述: five-year=old和five years old用法有什么区别啊 1个回答 分类:英语 2014-10-06 问题解答: 我来补答 前者用于名词前面修饰 后者相当于表语吧例 he has a five-year-old son.his son is five years old. 展开全文阅读