Open drainage
引流───drainage;开口───Opening
Hundreds of miles of drainage canals were built in the wetlands.───湿地上修建了数百英里的排水沟渠。
bricks were bedded in sand to improve drainage.───沙里埋入砖块，以改进排水系统。
The area has good natural drainage.───这个地区有良好的天然排水系统。
Water: Water used for the first drainage pipe may be out of colored water, a period of time, the water will gradually become clear.───给水：给水管道初次使用放水，可能流出有颜色的水，一段时间后，水会逐渐变清。
This seems to be an effective means of increasing the drainage efficiency once the sand beds are again flooded.───这个建议看起来是一个当沙床被再次灌溉后提高渗漏效率的有效方法。
Laser surgery may be used, to increase drainage of aqueous fluid out of the eye, especially if medications do not help enough.───可行激光手术增加房水自眼中引流，尤其是药物无法完全发挥作用时。
The defect in the drainage must be remedied.