Someone once asked Du Jiao what she would say if she could meet her research subject one day. She cursed: "What can I say to this scumbag?" But she still said calmly: "Teacher, when you mark the book, your hands should be steady and your handwriting should be more careful, so that I don't waste so many eyes on you proofreading and trying to figure out your handwriting."
Concept: Fog rises in the mountains in the morning