The first one is to clarify the background of this thesis, provide a clear purpose and objects we research, introduce correlative theories in order to establish the appropriate theoretical basis;
第一部分，主要阐明这篇论文研究的背景，明确论文的目的和论述对象，介绍相应的理论以建立论文论述的基础；
The first one is to clarify the background of this thesis, provide a clear purpose and objects we research, introduce correlative theories in order to establish the appropriate theoretical basis;
第一部分，主要阐明这篇论文研究的背景，明确论文的目的和论述对象，介绍相应的理论以建立论文论述的基础；
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