Chapter 2 mainly introduce the background and present situation of Unicom.
第二章主要介绍了联通的背景及现状。
The first part introduces the research background, present situation and the methods.
第一部分介绍了现实背景、研究现状、以及研究方法;
The first part introduces the research background, present situation and the methods.
第一部分介绍了现实背景、研究现状、以及研究方法;
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