公益广告通过对情态表达、情态取向的巧妙运用来表明观点，影响读者的态度及行为，达到劝说读者采取特定行动的目的。
By the use of various modal expressions and modal orientations, public service advertisements try to influence the reader' s behavior and persuade them to take certain actions.
公益广告，是指经媒介发布的为公众利益服务的不以营利为目的的广告。
Public service advertising, is that the public benefit serves point to being announcing after the intermediary not taking making profit as the purpose advertisement.
公益广告是为公众利益服务的、以推广有利于社会的公益观念为目的的广告传播活动。
The purpose of public service advertisements (PSAs) is to promote the useful concept for the public interest. It is an activity of advertising communication.
目的是深化对公益广告的理解，使我国公益广告能够更加符合传播学规律，加强公益广告的理论化和系统化研究。
The study aims to deepen the understanding of PSA, make our PSA tallying with the law of communication, and strengthen its theoretical and systematical research.
目的是深化对公益广告的理解，使我国公益广告能够更加符合传播学规律，加强公益广告的理论化和系统化研究。
The study aims to deepen the understanding of PSA, make our PSA tallying with the law of communication, and strengthen its theoretical and systematical research.
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