本部分介绍了本文研究背景、意义以及目的，并对研究方法和研究线路进行了介绍。
This part introduced this article studies the background, the significance as well as the goal, and has carried on the introduction to the research technique and the research line.
论文共分为五个部分：论文的前言部分介绍了论文的研究意义和研究现状，并对研究方法作了简要的说明。
There are five parts in all:The instruction part of thesis introduces the research significance and the current situation. And also give some brief explanation to the research methods.
第二部分则阐述本文力图回答的问题，以及其他学者对这个问题或类似问题的研究与看法，并对研究方法作一简要说明。
The second part tries to give an answer to the question, enumerates the researches and opinions of other researchers on the question, and briefly introduces the research method.
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