The completion of the thesis is attributed to many people's support andencouragement.
First and foremost, I want to extend my heartfelt gratitude to my supervisor,Professor Cao Daogen, whose patient guidance, valuable suggestions and constantencouragement make me successfully complete this thesis. His conscientious academicspirit and modest, open-minded personality inspire me both in academic study and dailylife. He gives me much help and advice during the whole process of my writing, whichhas made my accomplishments possible.
Also, I would like to express my sincere gratitude to all the professors who havetaught me in this university. Their instructions have helped broaden my horizon andtheir enlightening teaching has provided me with a solid foundation to accomplish thispaper and will always be of great value for my future career and academic research.
My thanks also go to the authors whose books and articles have given meinspiration in the writing of this paper.
Last but not least, I would like to express my special thanks to my parents, whosecare and support motivate me to move on and make me want to be a better person.
Upon finishing this thesis, I would like to express my great gratitude towards allthose who have offered me sincere assistance in the three years.
First and foremost, my hearty thanks go to my supervisor, Professor ZhangRuwen, who has given me insightful suggestions and constant encouragement both inmy study and in my life. Furthermore, Professor Zhang's painstaking teaching andvaluable advice have profoundly contributed to the completion of the present thesis.
Also, I own my thanks to all the professors who have taught and enlightening meduring my studies in the campus, for guiding me in the field of research work, whichis both challenging and fantastic. The experience and profit I obtained will be ofgrand importance to my further studies.
Finally, I am also grateful to my family and friends, who encourage and supportme and share with me my worries, frustrations, and happiness.
I would like express my gratitude to all those who offer great help for my thesis.
First and foremost, my deepest gratitude goes to my supervisor Professor YuMuhong, for his father-like encouragement and guidance. He provided me withabundant suggestions and priceless criticisms for my writing of the thesis. But for hisconstant patient guidance and enlightenment, the thesis would have become a missionimpossible.
My sincere thanks also go to the teachers from the School of Foreign Languages ofZhejiang University of Finance and Economics, who jointly led me into the holy templeof academic field. Here, I want to send my gratefulness to those respected teachers likeProf. Wang Baorong, Prof. Li Changbao, Prof. Chen Xianghong, Prof. Shao Youxue,Prof. Teng Chao, Prof. Cen Qunxia etc. Thank you for your being with me and beingthe witnesses for the birth, growth and perfection of my thesis.
I feel indebted to my parents, without their mental and material support, I couldbarely finish the thesis on time.
Finally, my thanks should be sent to all my classmates, for their endless supportand warm hearts, making me feel like living in a united big family.