4-year- old是正确的,表示 4岁,只能作定语.例如：He is a 4 -year-old boy.
4 years old 是正确的,表示 4岁.例如：He is 4 years old.
20 minutes' ride 表示复数名词的所有格,意思是：骑车20分钟的路程.
不以s 结尾的名词所有格加 ‘s ,
以s 结尾的名词所有格加 ’.
英语这样的复合词怎么用?4-year old还是4-year- old?4 years old还是4 years' ol
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