three- day + time 三天的时间
three days + time 没有这种用法,可以说 three days 表示三天
three days' + time 三天的时间 等于 three-day time
three day's + time 没有这种用法
【解析】
有连词符的情况下,名词一律用单数 如：three-year-old boy
没有连字符的情况下,如果名词可数,一律变复数
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three- day,three days,three days',three day's区别?
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