twelve-year-old 作为一个形容词,可以修饰名词。
如:
He is a twelve-year-old boy. 正确
He is twelve-year-old 错误
twelve years old 是不可以作为形容词来修饰名词的。
如:
he is twelve years old 正确
he is twelve years old boy 错误。
两者是不等同的,不能互用的。
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twelve-year-old 作为一个形容词,可以修饰名词。
如:
He is a twelve-year-old boy. 正确
He is twelve-year-old 错误
twelve years old 是不可以作为形容词来修饰名词的。
如:
he is twelve years old 正确
he is twelve years old boy 错误。
两者是不等同的,不能互用的。