This is a preface, written with a computer.Using a computer to write seems to be nothing new, but I use the latest language typewriter.This, to me, is extremely fresh. It feels so strange to suddenly be able to use a pen that has been used for more than 30 years.Moreover, instead of using a pen, there is almost no use of hands.Its wonder is indescribable. I was very greedy, and thought to myself, the era of turning sounds into words has come, so will the era of turning thoughts into words be far behind?I would like to thank Ye Lihua and Zhu Minjuan for teaching me how to use computers.