prof＝professor，takeattendance点名。
＊god，ionlymissedtwoclassesandi＇malreadyoutofit.
beoutofit是跟不上的意思，所以得catchupwiththemasap
＊hey，igotthewholeinfofromtheupperclassman.
info＝information，upperclassman学长，也可能学长为seniors或olderguys
＊thatguyisatoughnut.iguessthisclassisabear！
难缠的老师称为toughnut，bear表示很难的科目。
＊istruggleforwordswhenaskedasuddenquestion.
struggleforwords难以回答