Harry Potter and the Old Ones

I'm so sorry, comrades! I recently stopped working for a month, mainly because I started working as a scientific research assistant in my PhD research group on July 14. My PhD supervisor requires me to exercise for at least two hours a day and read a literature. In addition, my uncle's family recently traveled to BJ. I am going on a business trip to Fujian and Jiangxi next Monday, and the elders at home are not emotionally stable, so I can say that I have been very busy recently, so I can only update it casually these days. I will write as much as I can. I hope everyone can forgive me.