In order to ensure the quality of this book, at the suggestion of all book friends, I decided to revise the early part of the manuscript in my hand, which may not be updated too quickly during this time, I hope you can understand!

But I won't stop changing, at least every day for the time being, put it at about eight o'clock in the morning, and this situation won't be too long, at most a week I will resume two shifts a day, thank you for your support!