"But I'm still very optimistic about Earth's future. Give Earthlings another one or two hundred years, when their population increases, a quantitative change will definitely lead to a qualitative change, and they'll easily step into the industrial era."
...
Lin Xian was listening to Wei Shengjin's assessments of history, humanity, and civilization, feeling that they were quite insightful:
"You seem to know a lot… What did you do on Mars?"
"Heh, before retirement, I was a teacher at a university."
"Oh wow, impressive!"
Lin Xian praised:
"Then, should I call you Professor Wei in the future, or…?"
"Ay, I wasn't a professor, just an ordinary teacher; you can just call me by my name."
"Then I'll call you Teacher Wei!" Lin Xian was still trying.
"Ah, whatever you like."
While speaking, Wei Shengjin stood up and patted the dirt off his clothes: