Sorry to all the book friends, I fractured my wrist a week ago. Yesterday, the doctor said that the joint surface is not smooth and needs to be corrected with a steel plate. I have not been able to update it for a while, so I will take a leave of absence for two months. But don’t worry, this article is by no means too superficial. I still have a lot of things I want to write that I haven’t written, and there are still a lot of dug holes that have not been filled. Please look forward to it in two months, thank you very much!