Estimating of substitution number of amino acids is basic statistic methods of measuring evolution distance between proteins, which is the base of researching molecular evolution of protein.
氨基酸替代数的估计是测定蛋白质分子间进化距离的基本统计方法，是研究蛋白质分子进化的基础。
Statistic is the basic course that is necessary in the information society, which is the important tool to collect , arrange and analyses the information.
统计是信息社会必修的基础课程，是收集信息、整理信息、分析信息的重要工具。
The measurement of central tendency and dispersion is the most basic statistic analysis of spatial pattern.
集中趋势的度量和分散趋势的度量是对空间模式最基本的统计分析。
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