Sunday is the last day of a week Monday is the first day of a week There is seven days in a week

【专家解说】：是改错吧？ Sunday is the first day of a week Monday is the second day of a week There is seven days in a week 星期天是一周的第一天；星期一是一周的第二天。一周有七天。( last -> first ; first -> second )