sixteen-year-olds跟sixteen-year-old有什么区别？

sixteen-year-olds跟sixteen-year-old有以下区别：

一、sixteen-year-olds只有一种词性。名词。因为后面加了s。同类用法只要改前面的数字。

双语例句：

1、Eighteen-year-olds qualify to vote .

译文：年满十八岁者有选举权。

2、Even five-year-olds do not want a party every day. 

译文：就算是5岁的孩子也不想天天聚会。

二、sixteen-year-old通常只做形容词用。

双语例句：

1、Sixteen-Year-old Hans stepped forward. 

译文：十六岁的汉斯向前地踏。

2、Mike is a sixteen-year-old boy. 

译文：迈克是一个16岁的男孩。

sixteen -year -olds 16岁的人，名词
sixteen -year -old 16岁的，形容词

先看例子： 1.He is sixteen years old.
2.They are sixteen --year---olds.
3. He is a sixteen--year---old boy.
例2 中 sixteen --year---olds是名词 例3中sixteen--year---old 是定语