问一下seven-years-old和seven years old有什么区别!

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问一下seven-years-old和seven years old有什么区别!
问一下seven-years-old和seven years old有什么区别!

问一下seven-years-old和seven years old有什么区别!
正确的应该是seven-year-old ,两个都是一个意思,没有区别.前者记得去掉year的s

1、seven-year-old作定语,其中year为单数形式;
He is a seven-year-old boy.
2、seven years old作表语,其中year为复数形式;
The boy is seven years old.

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