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言据性是指知识的来源以及说话人对知识可靠性的态度。本文以言据性为基础,对语言学、计算机科学、医学和经济学这四门学科的400篇博士学位论文语料库进行统计和分析。结果显示:四门学科中均使用感官型据素、报道型据素、信念型据素和推断型据素,其中,对信念型据素的应用频率偏低。在人际意义方面,言据性可以用于评价信息的可靠性,可以作为元语篇引导读者理解语篇,表达对命题或读者的态度。
Evidence refers to the source of knowledge and the speaker’s attitude towards the reliability of knowledge. Based on the evidence, this dissertation collects and analyzes 400 Ph.D. dissertations corpora in the four disciplines of linguistics, computer science, medicine and economics. The results show that sensory type, report type, belief type and inferred type are all used in the four subjects. Among them, the frequency of application of belief type is low. In terms of interpersonal meaning, evidential can be used to evaluate the reliability of information, as a meta-discourse to guide readers to understand the discourse, express their attitude to the proposition or reader.