请修缮这段文字要求表达要清晰语法要准确。Since the first public service public service announcement was released in China in 1986 public service announcement has gone through more than 30 years of development in China Wit

Since the first public service announcement was released in China in 1986, public service announcements have undergone over 30 years of development in China. With the advancement of science and technology, public service announcements have encountered unprecedented opportunities and challenges. Based on the current literature, scholars' research on "public service announcement language" primarily focuses on the following aspects:

Firstly, research on public service announcement language with relevant theories. Guo Shuaijie (2021) discusses the multimodal metaphor characteristics of social civilization and health based on conceptual metaphor theory and multimodal metaphor theory. Shi Xinghui, Yang Jizhao, and Zhang Yanan (2012) explore the characteristics and social functions of public service announcement language, as well as the social psychology reflected by public service announcement language, and further clarify the value guidance and guidance function of public service announcement language. Su Xingpin (2017) explores the types of focus in public service announcement language and its realization, and analyzes the characteristics of focus types and focus realization methods in public service announcement language. Cheng Jing (2016) explains why public service announcement language focuses more on the combination of Chinese idioms, proverbs, idioms, etc., and analyzes the advertising memes of genotype and phenotype. Dong Li (2012) uses the theory of conversational implicature to appreciate the public service announcement language that appears in our daily life, and discusses the profound meaning and communication effect of advertising language.

Secondly, explore the rhetoric application of public service announcement language from the perspective of traditional rhetoric. Li Yuting (2018) recognizes the regularity and classification characteristics of metaphor from the perspective of cognitive linguistics, confirms the use of metaphor in public service announcement language, and explores the impact of metaphor on public service announcement language. Wu Jiahuan (2018) explains how the public service announcement language using the rhetoric variation has improved the efficiency of language expression, enhanced the flexibility and freedom of language expression, and enhanced the image, readability, and implication of language. Qiu Yingying and Xu Chenchen (2013) analyzed the types and characteristics of metaphor and metonymy in campus public service announcement language, pointing out that metaphor in public service announcement language is mainly ontological metaphor, and metonymy is mainly metonymy between the whole and the part. Zhao Hongzhen (2013) uses stylistic theory to analyze its stylistic features and effects from three aspects: vocabulary, syntax, and rhetoric. Yang Ping (2012) uses metaphor theory to study public service announcement language in China, and discusses the characteristics of metaphor in public service announcement language from the structural level, cognitive semantic perspective, and cultural perspective.

Thirdly, language strategies in public service announcement language. Zhang Gou (2020) uses Halliday's systemic functional grammar theory to explore how to use language means to enhance the appeal, influence, and persuasion of language, and ultimately achieve the effect of appealing to and calling on the public to actively participate in public welfare activities. Li Jiayu (2017) expounds that pragmatic strategies and means are used to understand the pragmatic characteristics of public service announcement language and follow its pragmatic principles. Shi Mingxing (2012) analyzes the realization process of the persuasion function of public service announcement language from the aspects of the discourse characteristics and representation techniques of advertising language.

Finally, the pragmatic study of public service announcement language. Most of the pragmatic studies use the cooperative principle and politeness principle to explain public service announcement language, and also use relevance theory, adaptation theory, context, presupposition, memetics to analyze public service announcement language. Wang Shibo (2015) explores how Chinese public service advertising is used to adapt to the audience's communicative context. Adaptation theory can effectively describe and explain the use of public service announcement language. Yang Hongyan (2013) describes the pragmatic strategies of public service announcement language, analyzes the characteristics of the pragmatic strategies of public service announcement language, and deepens people's understanding of public service announcement language. Cheng Dandan (2009) explores the pragmatic failure of public service announcement from three aspects: figure of speech, pragmatic strategy, and style, points out that pragmatic failure hinders the development of public service announcement, and finds out the reasons for it. Wang Rongrong (2022) analyzes public service announcement language from a pragmatic perspective, and summarizes the role of politeness principle in public service announcement language. Wang Hongmei (2011) expounds that the language of public service announcement is expounded from the aspects of cooperation principle, politeness principle, speech act theory, etc., and analyzes how to make public service announcement language more persuasive and achieve better publicity effect.

In summary, scholars' research on public service announcement language mainly focuses on language strategy, rhetoric, and pragmatics. These studies have contributed to the research on public service announcement language and have achieved positive results. However, there is limited research from the perspective of speech act, so this paper aims to conduct a more systematic analysis of public service announcement language from the perspective of speech act to enrich the research results of public service announcement language