There are three major objectives of media research:(1) obtain knowledge about the educational or instructional effectiveness of a chosen medium;
大众传播研究有三个主要目标：（ 1 ）获得对被选择的媒体的教育或指导效力的了解；
However, these researchers found that parents' efforts to obtain this information were only weakly linked with the accuracy of parents' knowledge about their children.
然而研究人员却发现，父母为获得这些信息所付出的努力，与子女所反馈的信息的准确性，两者之前无甚关联。
The results showed that the patients hoped to obtain the knowledge related with the diseases themselves and the knowledge about family care, infectious diseases and chronic diseases.
结果病人比较重视自身疾病有关方面的知识，家庭保健知识，传染病和慢性病知识；
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