antecedent precipitation meaning in Chinese

期前降雨
前期降水量

Antecedent precipitation index
前期降水指数
The statistics show that the correlation of antecedent precipitation , lithology , landform , drainage density , drainage area , length and ratio of demotion of main river and four characteristics of low flow is very complex
统计结果表明：流域的枯季前期降水、岩性、地貌、流域面积、河网密度、主河道长度及其比降等因子与喀斯特流域的枯水四特征的相关关系异常复杂。
The factors include antecedent precipitation of low flow period and status of karst basins ( such as lithology , landform , drainage area , drainage density , length and ratio of demotion of main river and so on . ) . based on the former studies , integrated the conventional statistic methods , the technique of anns is applied in this paper for researching the law of the low flow of karst basins in guizhou altiplano
影响喀斯特流域枯水径流的因素异常复杂，其影响因素主要有枯季前期降水量和岩性、地貌、流域面积、河网密度、主河道长度及其比降等流域下垫面状况。本文在前人研究的基础上，采用人工神经网络技术，结合传统的统计方法，研究贵州高原上喀斯特流域的枯水径流规律。