In the 1980 s, Lakoff and Johnson proposed conceptual metaphor theory in which metaphor is not only considered as a lin-guistic phenomenon but also as the basic way of thinking, which can be reflected in all levels of language.The author will exploresthe discourse coherence functions of conceptual metaphor.And try to solve these problems: What factors of conceptual metaphor in-fluence the discourse coherence? How can these factors form a coherent discourse and which one plays the central role?
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