AcknowledgmentsFirst and foremost, I would like to express my heartfelt gratitude to Li Yahong, my supervisor, for his continuous support and helpful instruction, for his valuable and constructive advice through the development of my thesis
Without his generous instruction and painstaking revision, the thesis would have never been finished
I wish to express my sincere gratitude to all the professors and teachers in the College of Foreign Languages
They have given me generous instruction and kind encouragement during my study
And their inspiring guidance will continue to have a profound impact on my study and my work
Special thanks should be given to my family for their support for me during all these years
Deep love, continuous support and expectation are always my strongest backbone w