16-year-old和16-year-olds和16 years old有什么区别?

16-year-old和16-year-olds和16 years old有什么区别? 16-years-old和16-year-olds的区别 sixteen -year -olds和sixteen -year -old有什么区别 six years old 和 six- year- old 和 six- year- olds的区别 11-year-old和11 years old有什么区别 three-year-old 和 three years old 有什么区别 three -year-old 和 three years old有什么区别? sixteen-year-olds跟sixteen-year-old有什么区别? 16-year-old 跟16 years old什么区别啊? year olds还是years old? year-old和years old的区别 sixteen year old、sixteen-year-olds、sixteen-year-old有什么区别