water and sand condition的用法和樣例：
例句
- The result shows that it is resultful to decrease the sediment depositing to the reservoir area when reducing the water level at the same incoming water and incoming sediment.
計算結果表明在同等水沙條件下，降低庫水位對於減少庫區泥沙淤積是有利的。 - In a word, it is necessary to use the hydrodynamic model to give the water levels at any sites when compiling the bathymetrical data for accurate results.
黃河口治理的出路是，在於控制適當的入海水沙條件和用較大的容沙體積換取較長的行河時間。
