The water level in some lakes may vary greatly. 某些湖泊的水位变动极大。
Adjustable float for optimum water level control. 通过调节浮球能保持最佳水位。
The boatman kept a sharp eye on the wind and water. 船老大仔细观察风头和水势。
Soil matric potential, leaf water potential and atmosphere water potential is diversity in temporal and spatial variation. 通过相关性分析得出土壤基质势，叶水势，大气水势三者在时间和空间上都有很大的差别。
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