摘要： fifteen-year-old 作形容词 15岁的 fifteen-year-olds 作名词指15岁的人 fifteen years old 指年龄 15岁 如: a fifteen-year-old boy 一个15岁的男孩 Fifteen-year-olds like to sing. 15岁的人喜欢唱歌. I am fifteen years old . 我是15岁.

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