Drainge引流drainv.排出；排干；喝光；耗尽n.下水道；消耗drain the transmission从齿轮箱内放油drain channel junction漏极 沟道结drain-source voltage漏源电压drain waterlogged area排涝drain extension region漏延伸区Drain to the work tank抽回工作箱draining transformator排流变压器drain water from field把田里的水排掉draining water station排水站draining water-logged排涝

1. A layer of coarse gravel is often placed around the drain tile.
   常常在排水瓦管周围铺一层粗石砾。