问一下seven-years-old和seven years old有什么区别!

问一下seven-years-old和seven years old有什么区别! seven years old和even-year-old的区别 Helen is seven years old. 18 years old和18-years-old有什么区别 When I was seven years old She learns English about seven years old. The old man ____ for seven years. 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? he's seven years old. seven years old 划线部分提 sixteen-years-old与sixteen years old有什么区别