three -year-old 和 three 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?
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six-year-old boy和six years old boy 有什么区别?一样么?为什么?
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fifteen-year-old 和fifteen years old 有什么区别?包括他们各自的用法