求翻译：《人民的选择》对于传播学学术思想的贡献主要体现在两方面。一是大众传播的有限效果论，一是“两级传播”和“舆论领袖”观点的形成。是什么意思？

"People's choice" for the Communication major contribution to academic thinking is reflected in two aspects. First, the limited effect on the mass media, one "two communication" and "opinion leaders" view of the formation.

The people's choice for the dissemination of academic thinking manifested in two aspects of contribution. First, the mass of limited effect, a theory is a "two-level communication" and "Opinion Leaders" viewpoint.

"People's Choice" mainly manifests regarding the dissemination study academic thought contribution in two aspects.One is the mass media dissemination limited effect theory, one is “two levels of dissemination” and “the public opinion leader” the viewpoint formation.

Academic thinking of the people's choice for communication is mainly reflected in the contribution of two aspects. First, the limited effect of mass communication, first is the "two-level dissemination" and "opinion leaders" view form.

Academic thinking of the people's choice for communication is mainly reflected in the contribution of two aspects. First, mass communication limited effect, one "spread levels" "public opinion leaders" formation.