I wonder if the prof took attendance1 already. 哎呀呀，不了解教授是否已经点名了!
prof＝professor，take attendance 点名。
God, I only missed two classes and I＇m already out of it. 天哪! 我才误了两节课，可是已经跟不上了!
be out of it 是跟不上的意思，所以得 catch up with them ASAP
Hey, I got the whole info from the upperclassman. 喂，我已经从学长那里拿到所有些资料了。
info＝information， upperclassman 学长，也会学长为seniors或 older guys
That guy is a tough nut. I guess this class is a bear！这老师比较难解决，我估计这门功课悬了!
难缠的老师称为 tough nut，bear表示非常难的科目。
I struggle for words when asked a sudden question. 忽然被问到时我都得措词半天。
struggle for words 很难回答
