six-year-old和six years old用法有什么区别?

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six-year-old和six years old用法有什么区别?
six-year-old和six years old用法有什么区别?

six-year-old和six years old用法有什么区别?
前者可当adj.用 She is a six-year-old girl.
后者当表语 She is six years old.

没有区别,完全相等,只是因为有了连字符“—”,所以就不用复数了~

six-year-old是作前置修饰语用的,比如,my six-year-old sister, 而six years old通常用在系表结构当中,比如,My sister is six years old.

six-year-old 比如 she is a six-year-old girl。
但six years old 的相等例句是 she is six years old 。前面不用冠词 “a”后面也不用加名词“girl”。