*I wonder if the prof took attendance already.
prof=professor,take attendance 点名。
*God, I only missed two classes and I'm already out of it.
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.
info=information, upperclassman 学长,也可能学长为seniors或 older guys
*That guy is a tough nut. I guess this class is a bear!
难缠的老师称为 tough nut,bear表示很难的科目。
* I struggle for words when asked a sudden question.
struggle for words 难以回答。