There is no computer codeword these days, and after thinking about it carefully, I found that the fourth volume is indeed unsatisfactory, and when the computer comes back next Tuesday, the fourth volume will be greatly revised. The book is really not as good as it should be, and I can only do my best.

The update reply time is next Wednesday.,First one update per day.,After that, two updates per day.,Make up the arrears of chapters on the weekend.