摘要：Discourse analysis is an essential branch of linguistics, and cohesion and coherence are the core issues of discourse analysis. However, many scholars carry out discourse analysis from a specific perspective, and few analyze it from multiple levels simultaneously. Besides, the analysis of the speech is relatively few. Therefore, the study of the multi-level analysis of that style is valuable. This paper is divided into three parts. The first part is the introduction of the theoretical background, expounding the academic research of Halliday, a foreign expert, and Hu Zhuanglin, a domestic representative, and the introduction of the discourse Two Truths to Live by. The second part is the main body of this paper, which explains the function and effect of cohesion and coherence theory by analyzing the sentences in selected texts. Finally, it summarizes the research results. It examines the role of cohesion and coherence in expressing the author's intention and highlighting the theme of the work, so as to cultivate the ability of writing papers, speeches, and other writing styles.
关键词：cohesion and coherence;socio-semiotic level;semantic level;lexical level
