gravity current

• 重力流

gravity current的用法和样例：

例句

1. The purified water then descends by gravity to a basement holding tank.
   经过净化的水靠重力流到地下室的另一个集水箱里。
2. In flat terrain, sewers enroute to a treatment a small plant may increase in depth to the point where it is impractical to continue gravity flow.
   在平坦地形地带，排水管线再道小型污水厂途中可能深度增加到以重力流不切实际。