Introduction: At the end of the paper, the thank-you part of the paper is to thank those who have helped this study, which is conducive to promoting the formation of a social atmosphere of mutual assistance. The following is a thank-you speech for the graduation thesis I shared. Welcome to read!

In a blink of an eye, two and a half years of postgraduate study and life will be over, and it seems as if it was yesterday when I entered school. I can still remember the scene when I first came. Recalling the dribs and drabs of these two and a half years, I am deeply moved, gratified and grateful. Fortunately, I spent more than two years in sweat and hard work, and I learned a lot from it. Fortunately, I came to a good environment, met many tutors and friends, and gave me a lot of guidance and help, which enabled me to finish my studies smoothly. Thank you again from the bottom of my heart!

I am most grateful to my tutor Professor Hu Zhiwen. I know I can't express my gratitude to Mr Hu in words. It was Mr. Hu who gave me a sky and a space to spread my wings and fly. Teacher Hu gave me academic direction, warmth in life, courage in action and an example in life. When I failed, Mr. Hu cheered me up; When I gnashed my teeth, Mr. Hu cheered me on; When I succeeded, Mr. Hu reminded me to move on. In a word, Mr. Hu gave me the greatest trust at any time. Through his words and deeds, I learned a lot of things that are not in books, which is also the most precious wealth I have obtained.

Thanks to Professor Chen Wenxing and Professor Yao Juming for their guidance and help in the experiment, and for their valuable suggestions on the revision of the paper. Thanks to Brother Wan Junmin for his great contribution in the preliminary work of this project, as well as his great guidance and help in the route design, product synthesis and characterization of this experiment and the closing work in the later stage of the paper. At the same time, I thank them for their care and help in life.

I would like to thank Mr. Wu Ziying, Mr. Xiang Gaogong, Mr. Hu Yuqun, Mr. Zhang from the Analysis and Testing Center for their help in the experimental test, all the teachers from the Institute of Materials and Textile, and all the teachers from the Graduate Office for their support and help in the experiment.

Thank you to brother Zheng, brother Bing Wang and sister Zheng Hailing in the laboratory, as well as the undergraduates, Wu, Wu Gaoming, Wang Jian, Bian Ruiqi, Gao, Lin Ya who conducted the experiment with me. Thank them for their help in my work, for creating a happy and harmonious environment, and for bringing the sunny spring atmosphere.

I thank my parents, my brothers and sisters, and my girlfriend who loves me deeply. I know that without their support, I wouldn't be where I am today, and I also know that I can never fully repay their love, so I hope to finish my studies smoothly, strive for greater success and give them some comfort.

Thank all the teachers, classmates and friends who have helped me, and thank all the people who have cared about me and helped me. Without their concern for me, I would not have achieved what I am today. Thanks to Zhejiang Sci-Tech University, she added a lot to my life, gave me a new and higher starting point, and made me face the future challenges more calmly and confidently!

I want to send this document to all those who have paid attention to me and wish them all the best!

In this process, first of all, I want to thank my tutor, Mr. Liu Jinfang. The whole thesis was completed under his careful guidance and care. From topic selection, conception, data collection to the establishment of experimental environment, Mr. Liu devoted a lot of effort and sweat. He pointed out the direction for my subject and provided me with a good research and practice environment, which enabled me to grasp the development trends at home and abroad and obtain the latest technical information.

Teacher Liu not only gave me selfless education and help in my study, but also gave me correct guidance and inspiration in my life. I have learned professional knowledge and many principles of being a man. Without Mr. Liu's careful cultivation, I could not have made progress today. During my postgraduate study, my teacher has always taught me to have a serious, rigorous, realistic and pragmatic learning attitude, and I have always kept this in mind during the whole thesis writing process. The successful completion of the thesis is inseparable from the teacher's careful teaching. It is the teacher's rigorous academic attitude that infected me and made me forge ahead in theoretical research and pursue truth in experiments.

Teacher Liu's profound professional knowledge, work style of striving for perfection, tireless noble ethics, noble demeanor of being strict with oneself and being lenient with others, unpretentious and approachable personality charm deeply touched me, which made me clear my life course and benefited me for life.

I also want to thank my parents in particular, who supported me financially and spiritually. Their selfless love is the driving force for me to keep moving forward, and their understanding and encouragement accompany me all the way forward. I also want to thank my classmates, who helped me when I was in trouble.

Thanks to all the teachers, classmates, friends and relatives who have cared and helped me. During the three years of postgraduate study and life, many teachers and classmates gave me selfless help, and I learned too much from them. The continuous positive spirit of teachers and classmates in the school also deeply infected me and made me close to it. Please accept my most sincere thanks.

Finally, I would like to express my heartfelt thanks to the experts who took time out of their busy schedules to review this article and put forward valuable opinions!

Thanks for the excellent graduate thesis Part III: This topic was completed under the careful guidance and care of my tutor, researcher Li Huiqing. The tutor's rigorous scientific research ideas, realistic academic attitude, profound knowledge, dedication and keen insight into scientific research work are the models of my lifelong learning. Here, I would like to express my highest respect and heartfelt thanks to my tutor for his meticulous academic guidance and life care in the past three years.

I sincerely thank President Zhao, Deputy Secretary, Deputy Secretary Jiang Xihong and Teacher Li Shibao of Shandong University for their care and help in business and life. Thanks to Professor Jiang Baofa, Professor Jia Cunxian and Professor Wang for their help in my study.

I am grateful to Mr. Gao Xueqin and Mr. Huang Haiyan from the Biological Center of Shandong Academy of Medical Sciences for their selfless help in my experiment.

Thanks to Dr. Xing Jie from Qilu Hospital Laboratory of Shandong University and Dr. Li Na from Institute of Dermatology and Prevention of Shandong Academy of Medical Sciences for their help and support in specimen collection.

Thanks to the leaders and relevant personnel of Zhangqiu Family Planning Service Station, Zhucheng Family Planning Service Station, Daiyue Family Planning Service Station and Wudi Family Planning Service Station for their strong support and help in this field investigation and specimen collection.

Thanks to Mr. Diao Yu Tao from Epidemiology Research Office of Shandong Academy of Medical Sciences for his support and help in scientific research.

Thank you for your concern and help in my study and life, Dr. Wang Zhiping, Dr. Zheng Guohua, Dr. Chen Huibo, Dr. Zhou Yingzhi, Dr. Yang Yanfang, Master Fang, Master Kevin·Z and Master Huang Kefeng.

Thank my family for their full support and concern for my study and life.

Finally, I would like to thank all the teachers and classmates who have given me care and help in my study, life and thesis completion.

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