eight years old与eight- year-old

eight -year old 与 eight years old的区别 eight years和eight-year-old和eight-years-old和eight year old an eight-year-old child与an eight years old child 的区别 She is an eight-year-old girl与She is 8 years old的同义句. she is an eight years old 还是she is an eight-year-old girl对 a girl of 后面加eight years old还是eight-year-old?为什么,麻烦详细一点 为什么是she is an eight-year-old girl?she is an eight-years-old eight-year-old和eight years old做选择题时该怎么看 是a eight-year-old 还是an eight-year-old She is eight years old. 英语 复合形容词一个八岁的男孩：an eight-year-old boy或者an eight years old bo My son is eight year old.改错