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。

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It is because advertisements have powerful influence that the profiteer often tricks the public by them.

因为广告拥有巨大的影响使得获利者通过他们欺骗群众。

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It has a direct influence on the circulation of the journal, while the advertisements in the journal are restricted by the journal circulation. These three parts have a reciprocal relationship.

期刊质量直接影响到期刊的发行量，发行量又制约着发布广告的数量，广告数量对期刊质量又有影响，三者互为因果关系。

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