AcknowledgementsI would like to avail myself of this opportunity to express my sincerethanks to all those who have offered me help and encouragement duringthe process of my writing and revising this essay.First,my debt of gratitude is to my tutor,Professor Ye Xingguo.Withouthis insightful guidance,continuous support and constructive advice,thisthesis would have never been possible.My acknowledgement also goes to all my teachers for their valuableinstructions during my two-and-a-half-year-long study in ShanghaiInstitute of Foreign Trade.In addition,I feel grateful to all the authors for the ideas in their papers aslisted in the bibliography,which excite my aspirations during thepreparation of my essay.Finally,I like to dedicate this essay to my parents whose selfless love andcare always motivate me to overcome numerous difficulties and pursuemy own dreams.
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