请问是six-year-old还是six years old还是six-years-old?(这个空签名有个a )
问题描述：
请问是six-year-old还是six years old还是six-years-old?(这个空签名有个a )
答
如果这个空前面有个a,那就是填six-year-old,它相当于一个形容词,六岁大的.如
He is a six-year-old boy.他是一个六岁大的男孩.