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2019 i Acknowledgments Many people have helped me a lot in this thesis writing, including my supervisor, my seniors, my parents, and friends. Firstly, I would like to express my sincere gratitude to my supervisor, Prof. Xu Yan, for his invaluable instructions and comments, extraordinary patience and consistent encouragement on my research. He gave me much help by providing me suggestions and inspiration for novel ideas. It is his advice that draws my attention to all these new things, likedoi:10.32657/10356/136774 fatcat:6idykthcangrjiyeinctilhoju