three-year-old 和 three years old 有什么区别

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three-year-old 和 three years old 有什么区别
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three-year-old 和 three years old 有什么区别
three-year-old 和 three years old 有什么区别

three-year-old 和 three years old 有什么区别
three-year-old为形容词,比如:
my three-year-old sister
three years old为单词组合,比如
my sister is three years old.

意思一样,用法不同,前者是词语,后者是语句