比喻的本体和喻体必须是本质不同的事物。
It is certain that the tenor and the vehicle of rhetorical figure are in essence different.
比喻的意象认知功能的前提，就是意象性喻体与本体所具有的同构关系。
The functional precondition of cognition for figurative image remains an isomorphic relation of image between the parabolic objects and noumena.
第四和第五部分进一步讨论了汉英比喻在喻体喻义上的差异以及造成差异的原因。
The fourth and fifth part further discuss the differences of the connotative meaning in Chinese and English metaphor and the reasons that cause the discrepancy.
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