annual variation of water level  多年动态

anomalous variation of water temperature  水温异常

coefficient of variation of grade  品位变化系数

equation of variation of energy  能量变化方程

forecast of the variation of water level  水位变化预测

Hamilton’s law of variation principle  哈密顿变分原理

law of variation  变异规律; 变化规律

Law of water-moving and variation  变化规律

method of variation of constant  常数变易法

method of variation of parameters  参数变异法

seasonal variation of water type distribution  季节变化

the equation of variation of energy  能量变化方程

time-variation law of arc length  弧长变化规则

variation law of antibody titers  抗体消长规律

variation law of soil water content  动态规律; 水分变化规律

variation of water and sand  水沙变化; 水砂变化

variation of water depth  水深变化

variation of water level  水位变化; 上游水位变化

variation of water permeability  水通量变化