The main methods for calculating designed flood are probable maximum precipitation and hydrologic frequency analysis.
设计洪水计算方法主要是可能最大降雨和水文频率法。
The cline is considered the probable result of geographic trends in precipitation, temperature, and perhaps also photoperiod.
人们认为这种梯度变异可能是降水量，温度也许还有光周期等地理趋势造成的结果。
The cline is considered the probable result of geographic trends in precipitation, temperature, and perhaps also photoperiod.
人们认为这种梯度变异可能是降水量，温度也许还有光周期等地理趋势造成的结果。
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