介绍了文章的选题背景与意义、研究进展、研究内容，研究的主要思路、方法、技术路线及相关理论基础。

Preface. In this part the background, the significance, the current condition, the content, the outline, the methods, the technique employed, and relative theories are introduced.

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介绍了文章的选题背景与意义、研究进展、研究内容，研究的主要思路、方法、技术路线及相关理论基础。

Preface. In this part the background, the significance, the current condition, the content, the outline, the methods, the technique employed, and relative theories are introduced.

youdao