Ever since Halliday and Hasan made an authoritative research on cohesion in 1976, it has been a crucial research topic in the field of discourse analysis.
从韩礼德和哈桑(1976)对衔接所作的权威性研究至今，衔接研究是语篇研究领域研究中的重要研究课题。
Extraction of the topic from utterances is part of the discourse analysis in a spoken dialog system.
语句的主题提取是口语对话系统中话语分析部分的工作。
Moreover, a qualitative analysis on implied negation in discourse proceeds by virtue of some linguistic theories related to this topic.
定性分析暗含否定在会话中的具体用法，并进一步探索其成因。
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