Chapter Four describes the design and implementation of this study, including research questions, study objects and research procedures.
第四章阐述了本研究的设计与实施，包括研究问题、研究对象和研究步骤。
Problem is the start point of scientific research work, and subject selection is the first step of the whole scientific research procedures.
问题是科学研究的起点，选题是科学研究全过程的第一步。
Chapter three puts forward research questions hypotheses and detailed research procedures of this study. And it introduces the resources of the corpus of this study.
第三章提出了本文的研究问题、假设及具体的研究步骤，并介绍了本文所选语料的来源出处。
Introduction includes the contents such as proposition, overview of previous studies, the purpose and significances of the subject, research methods and research procedures.
引言包括对研究课题的说明、前人研究概况、选题目的和意义、研究方法与研究步骤等内容。
The research procedures of event tree analysis are to determine the initial event, list events in the process, chart and analyze event tree.
事件树分析法的研究步骤包括确定初始事件、环节事件，绘制、分析事件树图。
The research procedures of event tree analysis are to determine the initial event, list events in the process, chart and analyze event tree.
事件树分析法的研究步骤包括确定初始事件、环节事件，绘制、分析事件树图。
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