论文首先阐述了选题背景与研究的目的和意义。
The paper first elaborates the goal and significance of background and research.
论文首先对研究背景、研究方法等进行了简单阐述，提出了研究目的。
First, the thesis describe the study background and study method, then put forward the objective.
本文首先阐述了论文的选题依据及研究意义。
This paper firstly expounds the basis of subject and significance of study.
本文首先阐述了论文的选题依据及研究意义。
This paper firstly expounds the basis of subject and significance of study.
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