方法：综述分析相关文献，并结合我们的研究心得，对上述三者的关系进行理论研究。

METHOD: By reviewing published references concerned and the experience achieved in the authors lab, the relations among the aboved -mentioned three are explored theoretically.

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本文共分为六个部分：第一部分首先对“人口素质”相关国内外研究进行综述分析，阐释研究背景；

This paper could be divided into six parts. The first part concludes relevant domestic and foreign theories on "population quality" and interpretation of research background.

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从一般因素、与治疗有关的因素、社会心理学因素方面，综述分析了乳腺癌病人发生抑郁的相关因素。

It reviewed and analyzed the relevant factors of breast cancer patients developed depression from aspects of common factors, therapy-related factors and social-psychological factors.

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