four-year 和four years有什么区别?

four-year-old和four year old有什么不同 four-year 和four years有什么区别? Four seasons in a year. only four year old意思 one year have four seasons的语法问题?one year have four seasons和 there are four seasons in a year.的意思有区别吗? every four years和every fourth year一样吗? every fourth year和every four years一样吗 every four years和every fourth year一样吗? four-year-old和middle-aged 杠表示是什么? there are four seasons in a year.用four提问 there are four season in the year. four画线提问 There are four s______ in a year. There are four s() in a year they have ball games four-------a year. four-year-old为什么year不用复数形式 three thousand two-year and four-year schools.three thousand two-year and four-year schools的意思 a four-year-old boy可以说成a four-year old boy This is a ___boy.He can't look after himself.A.four-years-old B four-years-olds C,four-year-old D four year old 一直分不清有连字符和没有连字符的区别