three-year与three-years的区别是什么?

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three-year与three-years的区别是什么?
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three-year与three-years的区别是什么?
three-year与three-years的区别是什么?

three-year与three-years的区别是什么?
three-year=three years
都指三年.three-years中不要连词符号.