Perhaps this old professor is very talkative in his usual time.
You can see some clues from the roll call just now.
This is conducive to students'increasing preference for teachers.
But in retrospect, it's easy for teachers to be ignored by students, so as to build up the prestige of being teachers.
Now, for example.
The old professor opens his mouth somewhat irritated and asks, "Why don't you respect me?"
The voice that kept refusing to answer the phone looked up and said lazily, "I don't disrespect it. My cell phone is broken and I can't adjust it to vibration mode."
As the saying goes, clay Bodhisattva still has three...