It took nearly two months to finish

It took nearly two months to finish writing this paper. In the process of writing this paper, I encountered numerous difficulties and obstacles, and I overcame them with the help of my classmates and teachers. In particular, I would like to express my strong thanks to my thesis advisor, who gave me selfless guidance and help and tirelessly helped me to revise and improve my thesis. Here I would like to express my heartfelt thanks to all the teachers who have helped and guided me!I would like to thank all the scholars involved in this paper. This paper quotes research literature of several scholars. Without the help and inspiration of their research results, it would be difficult for me to complete the writing of this paper.I would like to thank my classmates and friends for giving me a lot of materials in the process of writing the paper, as well as providing warm help in the process of writing and typesetting the paper.As my academic level is limited, the paper is unavoidably inadequate, ask you teachers and xueyou criticism and correction!