问题描述: fifteen-year-old 和fifteen years old 有什么区别?包括他们各自的用法 1个回答 分类:英语 2014-11-13 问题解答: 我来补答 fifteen-year-old 相当于一个形容词,修饰名词.fifteen years old 是“数词+名词+形容词”结构.比如:He is a fifteen-year-old boy.= He is fifteen years old. 展开全文阅读