Four years' study and life in college is coming to an end in this season. Looking back, I feel a lot, and I will face the beginning of another journey. On the occasion of the completion of this paper, I would like to express my sincere thanks to my tutor, Mr. * *, who has given me selfless guidance in my study, and to the teachers who have guided and helped me. The teacher is rigorous and knowledgeable. They have taken pains to guide me in topics selection, research, thesis writing and other projects, giving me great care and help, so that I can make less detours and make continuous progress. * * * The teacher is knowledgeable and approachable. He gave me a lot of advice when I was confused or unclear in writing my thesis, which made me think clearly. At the same time, I patiently answered many questions I raised, which benefited me a lot and mastered the basic research methods. Here, I only express my high respect and loyal thanks!

I thank all my classmates and friends who have helped me and cared about me. Their encouragement and understanding are my motivation to overcome difficulties and make continuous progress. Thank you.