! The thank-you speech after the thesis defense thanked Mr. von Neumann. It was he who built the world's first computer, which made our descendants turn guns from "academic bandits" with scissors and paste into "academic pirates with mice and tablets". Thanks to Mr. Bill Gates. He resolutely dropped out of Harvard with fearless heroism and sacrifice, which pushed human history into the information age. We are unimpeded on the information highway, and it is with the help of the network that we can find rich and informative papers and materials. It can be said that Mr. Bill Gates traded his dropout for the graduation of millions of China college students. Thanks to Baidu and Google. Their search function is huge, fast and free, which makes it easy for us to search for the "paper materials" we need. With these "paper materials", we can successfully complete our "patchwork" paper. I would also like to thank Google for adding translation function. Its translation is not only accurate but also powerful, and it can translate an entire paper at one time. Our foreign languages and literature depend on it. Thanks to my mentor. He put down his sacred dignity as a teacher and told me how to finish this paper as a friend. He told me how to collect information; He told me how to find relevant papers quickly; He told me which school's website has a master's and doctoral thesis in this major; He instructed me how to use the documents at hand to choose, choose, graft and integrate. The completion of this paper is inseparable from his careful guidance and tireless teaching. Thanks to the teacher in charge of defense. When I didn't know what it was, they only asked me two questions-did everyone know what it was written about? Know; Have you read all the reference materials? Yes, I did. Then I passed the defense. They are such amiable teachers, they are such considerate teachers, they are such approachable and great teachers. Thank those classmates who accompany me day and night. These days, they have worked hard with me to encourage and support each other. You help me find what I need, communicate in time, and avoid a paper crash.