本文从语用学的角度出发,依托Levinson关于预设触发语的理论框架,从词汇和句法层面上研究分析预设触发语在2012年美国总统第二场电视辩论中的应用。本文旨在研究两位候选人在具体的语境中如何使用预设触发语来激发特定的语用预设,以获得既定的辩论目的,从而帮助我们更好地理解政治体裁文章,并可以恰当的使用预设触发语来改善自身的辩论技巧。 Based on the theoretical framework of Levinson ’s presuppositions, this essay studies the application of the presuppositions in the second presidential TV debate in the United States from the perspective of pragmatics. The purpose of this paper is to study how two candidates can use predefined triggers in specific contexts to motivate specific pragmatic presuppositions for the purposes of a given debate to help us better understand political genres and to be appropriate The use of default trigger language to improve their own debating skills.