陈保亚提出的阶曲线理论为语言历史关系研究提供了两个重要的方法：概率计算法和阶曲线。
The Curve Theory of Ranks (CTR) proposed by Dr. Chen Baoya suggests two methods for the research in the field of historic relationships of languages: Probability Limit(PL) and the Curve of Ranks (CR).
陈保亚提出的阶曲线理论为语言历史关系研究提供了两个重要的方法：概率计算法和阶曲线。
The Curve Theory of Ranks (CTR) proposed by Dr. Chen Baoya suggests two methods for the research in the field of historic relationships of languages: Probability Limit(PL) and the Curve of Ranks (CR).
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