议程设置理论作为媒介效果的理论之一，揭示了大众传媒对于受众的影响。

As one of media effects theories, agenda setting reveals the effect of mass media to the public.

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议程设置理论、沉默的螺旋论、知沟研究等从侧面揭示了媒介排斥的过程和机制。

Theories of agenda-setting, silent spiral and knowledge gap reveal the process and mechanism of mass media exclusion from one side.

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首先，分析了媒介议程对公众议程的影响。然后，从传播效果的层次、受众媒介接触时间属性以及信息传播过程的把关行为，详细分析了议程设置理论的特点。

Then, it analyses the characters of the Agenda setting, from the level of the communication effects, the timely character of the public contacting the media and the gate keeping of the media.

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