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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