During the whole process of preparing and writing this thesis, I am indebted to a number of people who have offered me tremendous encouragement and support. I would like to extend my special thanks to my supervisor, Professor Chang Li, for her valuable advice and constructive suggestions, as well as encouragement and support. Without her logical rigor and her encouragement, I would not have been able to accomplish this thesis. I will always remember her and her painstaking efforts. Special thanks also go to Professor Ding Hengqi, who has also contributed a great deal of his precious time and energy to this paper. His generosity in providing topic information and materials has helped me to prepare and present my thesis as well. In addition, I would also like to express my appreciation to the following professors: Professor Wang Guanfu, Professor Chen Sudong, Professor Wu Fen and many others - whose lectures have enlightened me and given me much inspiration. Finally, I would like to express my thanks and love to my husband. Without his unfailing support, I wouldn't have accomplished my studies in UIBE.
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