sixteen-year-olds 这种表达正确么?

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sixteen-year-olds这种表达正确么?sixteen-year-olds这种表达正确么?sixteen-year-olds这种表达正确么?不对,复合形容词用单数sixteen-year-o

sixteen-year-olds 这种表达正确么?
sixteen-year-olds 这种表达正确么?

sixteen-year-olds 这种表达正确么?
不对,复合形容词用单数
sixteen-year-old

应该这样sixteen-year-old