分析两时间序列之间的超前和之后关系，计算滞时长度，多用于水文气象方面分析研究-Analysis ahead of and after the relationship between the two time series, calculating the lag length, used for the analysis of hydrometeorological

利用月值气象数据和Penman-Monteith公式计算流域蒸散发量的详细步骤及案例(Detailed steps and cases for calculating the amount of steaming in watersheds using monthly meteorological data and the Penman-Monteith formula)