本论文首先介绍了选题背景和研究意义。

The paper firstly introduced the background and the meaning of the subject.

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本文首先阐述了选题背景和研究意义，确立了研究内容及技术路线。

Firstly, this paper explains the title background and research meaning, and then establishes research content and technical course.

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论文首先论述本项目选题背景和研究意义，评述了前人研究的成果；

The thesis , first of all, focuses on the background of this project as well as its importance and then states the research results made in the past.

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