Thanks to my tutors and professors, their rigorous and meticulous style has always been an example in my work and study; Their persuasive teaching and eclectic thinking have given me endless inspiration.

Thanks to my teacher, every experimental detail and every data of this paper can't be separated from your careful guidance. Your cheerful personality and tolerant attitude helped me to integrate into our new laboratory quickly.

Thanks to my roommates, coming to this strange city from a distant hometown, it is you and I who maintain the brotherhood between each other and the harmony of the dormitory.

It's been four years, as if it were yesterday. In the past four years, we have never blushed, quarreled or had anything unhappy that we were worried about before going to college. It's just that it's rare for everyone to get together for New Year's Eve dinner every year. It doesn't matter. Let's go our separate ways. Take care.

I hope to go to other countries safely, stay in Fudan happily and leave our dormitory happily. I will remember the days when we were together all my life. Thanks to my parents, I can't get anything and I can't return it. My greatest wish is that you will be healthy and happy forever.

When the paper is about to be completed, my mood can't be calm. How many respectable teachers, classmates and friends gave me wordless help from the beginning to the smooth completion of the thesis? Please understand my sincere thanks.