70 years old与70-year-old的区别及其用法?

two years old与two-year-old的用法区别 year-old与years old的区别 years old 和year-old的区别和用法 twelve-year-old与twelve years old的区别及用法 thirteen years old 与 thirteen -year-old的区别 5 years old 与5-year-old的区别 15-year-old 与15 years old 的区别 thirteen years old与thirteen-year-old的区别 three years old 与 three-year-old 的区别 10-year-old与10 years old的区别 38 years old 与 38-year-old 的区别 10 years old 与10-year-old的区别