Chapter two defines the main concepts of Urban-rural labors and social exclusion, probe the study framework and try to expound the hypothesis, research methodology of this dissertation.

第二章对主要概念：城市农民工、社会排斥进行界定和研究框架讨论，并在此基础上提出了本文的研究假设，确定了研究方法和调查方案；

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She has been Associate Faculty of the Laboratory of Comparative Human Cognition at the University of California at San Diego since 2002 and Professor Emerita of Social Research Methodology at the Graduate School of Education and Information Sciences at the University of California at Los Angeles, where she taught from 1989 to 2009.

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