at weekend 与at the weekend

at the weekend与for the weekend的区别是什么? at the weekend造句 at the weekend同义词 "on the weekend" or "at the weekend" 如何区分at weekend 与 on weekend on the weekend和at weekend 我们说 on weekend ,at weekend,还是in the weekend at weekend,on weekend,at the weekend ,on the weekend,on the at weekend,on weekend,at the weekend ,on the weekend和on week At weekend和at the weekend有区别吗? at weekends和at the weekend 区别 英语中的at the weekend与on the weekend有什么区别?