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ollowed  by  the  exhibition  of  the  relationship  between megametaphor and conceptual metaphor. 
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2.2   Previous Studies of Megametaphors
The employment of megametaphor has a long history both in China and abroad. For a long time, megametaphor has been considered as an effective rhetorical device. The study of megametaphor focuses on its features and rhetoric functions at first, and later it is placed in discourse to explore its practical application,  epistemic  functions and so on. In  western  countries,  the  first  employment  of  megametaphor  can  date  back  to Homeric Age. Since then, megametaphor has arisen frequently in literary works. It is known to all of us that Shakespeare has an affinity to this means, so megametaphor gets the name of “the Shakespearean metaphor” (Berry, 1978). Even though the outcome of megametaphors in works is ample, the initial study of this topic starts quite late. It is the research of Werth (1994, 1999) that opens the door for the study of this topic. In 1994, Paul Werth realized that it is necessary and significant to carry out systematic study on a series of metaphors that sustain in a text, “I want now to look at another kind of extension, where a metaphorical field extends through an entire discourse” (Werth, 1994: 83). In consequence, he is the first to give the definition of megametaphor. He believes that “there may be an entire undercurrent running through a whole text, which may manifest itself in a large number and variety of  single  metaphors”  (1994:  80).  In  addition,  Werth  also  explores  the  notion  of megametaphor  by  taking  passages  from  E.  M.  Forster  and  Dylan  Thomas.  He contends that the concept of megametaphor actually results from the attention paid to the discourse  level of language rather than the sentence layer. With  Werth’s  efforts, the nature of megametaphor is unfolded. 
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Chapter Three   Theoretical Framework .... 15 
3.1   Idealized Cognitive Model .... 15 
3.1.1   Definition of Idealized Cognitive Model ............ 15
3.1.2   Four Models of Idealized Cognitive Model ........ 16
3.1.3   Properties of Idealized Cognitive Model ............ 17 
3.2   Megametaphor in Idealized Cognitive Model .... 19 
Chapter Four   Research Methodology ....... 22 
4.1   Data Collection ............ 22
4.2   Data Identification ....... 22 
4.3   Research Procedures .... 23 
Chapter Five   Results and Discussion ......... 25 
5.1   Megametaphors Used in American Presidential Inaugural Addresses ....... 25 
5.2  Meaning  Construction  of  Megametaphors  in  American ............. 26
5.3   Functions  of  Megametaphors  in  American  Presidential  Inaugural Addresses ......... 42 

Chapter Five   Results and Discussion 

Based  on  the  theoretical  framework  above,  this  chapter  aims  to  achieve  three goals. Fi本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。