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.
第一部分介绍了论文选题的背景、目的和意义。
The first section introduces the background of this thesis , the object and the meaning.
第一部分介绍了论文选题的背景、目的和意义。
The first section introduces the background of this thesis , the object and the meaning.
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