atwo
你的这个短语是对的，回答你的那个“red...”的那个人的是错的。用连字符连接两个词作定语的，名词不能用复数，如果不想用连字符，那么也可以这么写：two days' holidayI spent a two-day holiday at the seaside. 我在海边度过了一个为期两天的假日。I spent my two days' holiday at the seaside. 我在海边度过了我的两天假。以此类推：a three-hour drivethree hours' driveFrom where we live to the Europa Park in Germany, it's a three-hour drive. 从我们的住处到德国的欧罗巴公园得开三小时车。After three hours' drive, we were finally at the Europa Park in Germany. 开了三小时车后，我们终于到了德国的欧罗巴公园。