「・・・おい・・・おい、先生！」「え？・・・あ、ああ」「マジだいじょうぶ？休講にしたら？」

「・・・・・・、！」「？・・・、」「？？」

"...Hey... hey, Professor!" "Huh?... Oh, yeah." "Seriously, are you okay? Maybe you should cancel class."

Literal

"...Hey...hey, Professor!" "Eh?...ah, yeah." "Seriously okay? Made-it-a-cancelled-lecture [if-したら]?"

A three-way dialogue with a drowsy or distracted teacher. おい...おい is a repeated attention-grabber (rough masculine). The professor's え？...あ、ああ is a realistic sequence: surprise → realization → acknowledgment. マジだいじょうぶ？ uses マジ (slang for 'seriously') + 大丈夫 ('okay'). 休講にしたら is a suggestion: 休講 (きゅうこう, 'cancelled lecture') + にしたら ('how about making it...?'). The whole exchange captures natural, concerned student-teacher dynamics with realistic speech patterns.