three-week 与 three weeks\' 有什么区别

three-week 与 three weeks\' 有什么区别

意思都是“三个星期的”
three-week是个复合形容词,前面要有冠词、指示代词、名词所有格等修饰语,three weeks' 前面这不用。

three weeks' holiday
a three-week holiday
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