A preliminary review of existing literature was conducted in order to refine research question and understand the topic. Some key word, key terms and key authors were identified by the means of this preliminary research on the basis of which the subsequent secondary research was conducted. The sources of preliminary research are previous dissertations on similar topic, text books, and library’s databases.
初步审查现有的相关文献进行为了提炼研究问题和理解主题。一些关键字,关键术语和关键作者被确定的方法初步研究的基础上进行的后续二次研究。初步研究的来源是之前的论文在类似的话题,文本书籍和图书馆的数据库。
