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.
美国新闻传播学者从公共领域、新闻客观性、社会责任理论、媒介角色以及议程设置等方面对公共新闻运动进行了探讨。
They research public journalism from many aspects, such as public sphere, objectivity, social responsibility theories, and the agenda setting theory and so on.
通过对当代西方有关隐蔽议程的理论研究、社会实践的阐述和剖析，肯定了隐蔽议程问题的真实性，并指出其危害。
Through the contemporary western theoretic research, discussions and analysis of social practice of the area, the paper confirms the authenticity of the agenda, and points out its harm.
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