The introduction part explains the causes of the selection of the subject, describes the present academic research on price discrimination and presents the research methods of this thesis.
引言部分主要介绍本文的选题缘由、学术界对价格歧视研究的现状，以及本文研究所遵循的思路。
The adverse selection of population quality of China is not only the research object of many subject, but also is arguing focus of academe.
中国的人口素质逆淘汰问题不仅是多学科的研究对象，而且是学术界争论的焦点。
The selection of large primes is the key to construct RSA secret key. The production and test of large prime is an important research subject in RSA public key system.
大素数的选取是构造RSA密钥的关键，在素数的产生及测试是RSA公钥系统中的一个重要研究课题。
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