After being interrupted by his senior sister, Lu Zhou finished lunch, and by then, his lunch break was more or less over.
Chen Yushan accompanied Lu Zhou all the way back to the School of Mathematics's laboratory building. Only after repeatedly reminding him not to forget about the Russian delegation did she reluctantly wave goodbye and turn to leave.
Back in his office, Lu Zhou sorted through the lesson plans he had put together yesterday in his spare time, confirmed the afternoon schedule with Assistant Zhao, then headed to A Teaching Building with a yawn.
He had a Number Theory class that afternoon, a professional elective that carried credits.
His doctoral student, He Changwen, had originally been helping him teach these classes. But with more than half the semester already gone, Lu Zhou figured he ought to show his face at least once, so he went himself.
He did not know whether it was just his imagination, but it seemed like the students in the classroom spent more time staring at his face than at the blackboard...
Realizing this, Lu Zhou could not help feeling slightly dejected.
He had not taught undergraduates for so long that his teaching skills had apparently deteriorated to the point where he had to rely on his looks to make a living.
Thinking back to when he taught at Princeton University, when students from other departments had brought little stools and sat in the hallway to audit his classes, Lu Zhou could not help sighing with emotion.
It seemed he should still find more chances to teach personally whenever he had the time...
Before long, all four blackboards had been filled, and the bell for the mid-class break rang outside the classroom.
Lu Zhou closed the book in his hand. Just as he looked at