前言介绍了选题的原因、目的、意义及论文的大体框架。
The foreword introduced the selected topic reason, the goal, the significance and the thesis roughly the frame.
在前言部分，本文介绍了选题背景、意义和本文的研究框架。
In Introduction, the author stated the background of this topic and its research framework.
前言陈述了本文的选题原因、文献综述以及研究方法和论文框架。
The foreword presents the reason of the title choice, literature review, methodology and the frame of the thesis.
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