亲,
twenty-year-old为符合名词,实质上是一个单词；
twenty years old 为三个单词,
尽管二者的意思都是20岁,
但是twenty-year-old可以做表语、定语；
The twenty-year-old man doesn't know how to speak.
而twenty years old 一般只能作表语.
如：He is twenty years old .
twenty-year-old twenty years old 两个怎么用?
3个回答
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