什么情况下用five-year-olds?

什么情况下用five-year-olds? 谁能给我讲解下关于years old的用法鄙视复制,复制不给分.什么情况下用 years 什么情况下year 什么情况下olds five-six-year olds是什么意思与five six-year olds的区别是什么 sixteen -year -olds和sixteen -year -old有什么区别 year-olds与year-old的区别16-year-olds与16-year-old有什么区别吗? sixteen-years-old与sixteen years old有什么区别sixteen year olds与sixteen-year-old都是什么时候用 Sixteen-year-olds什么词性 sixteen years old 什么词性 five -year- olds像这样的泛指做主语谓语动词用单数还是复数?哎,到底是复数还是单数啊,纠结中 fifteen-year-olds是什么意思? seven-year-olds Twelve-Year-Olds翻译 英语翻译Teaching histroy to five-year-olds in a meaningful way can be very difficult. They were children.Four and five-year-olds,为什么old加s sixteen year old、sixteen-year-olds、sixteen-year-old有什么区别 -----olds are on the lake A.Five-six-year B.Five-six years C.Five six-years D.Five six years为啥选A 16-year-old和16-year-olds和16 years old有什么区别? three-year-olds汉语意思 year olds还是years old?