【提问】求救求救！！！我要给申请的学校写信这么些行么啊啊啊啊！

首先，你要是给学校写信，称呼最好写Dear Admission OfficerBesides, I wonder when I’ll be informed if I got enrolled and what rolling basis is.Besides, I am wondering when I will be informed in case I am fortunate to get enrolled. 关于询问rolling basis,最好放在最后P.S, please show me the meaning of "rolling basis", I am a little bit confused with that.