地下水平排水
underground lever drainage
水平排水板
horizontal drainage board
horizontal plastic drain
水平排水孔
horizontal drainage channel
Slope
新型水平排水体
new level drainage material
层拉平水平切片
horizontal slice of level flattening
城市给水排水工程
municipal water and wastewater engineering
城市节水水平
the level of city water-saving
城市节水水平综合评价
Comprehensive Assessment of Urban Water Saving Level