Contemporary metaphor research offers a cognitive view to help understand the existence of metaphor used in scientific language. Different from literary metaphor, used as a decorative device, lexical metaphor in scientific language has its unique features. And it serves not decorative function any more, but naming function, exegetical or pedagogical function and theory-constitutive function. With the understanding of reasons of lexical metaphor used in scientific language, people can have a deeper understanding of language and its metaphorical uses.
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