emptying something accomplished by allowing liquid to run out of it
同义词：drain
drainage例句
A long narrow trench or furrow dug in the ground, as for irrigation, drainage, or a boundary line.
沟渠，排水沟，水道在地面上狭长的沟渠或细沟，用于灌溉、排水或用作分界线
He came to look at the drainage.
他是来检查排水设备的。
The city was even equipped with a drainage system, for a great many clay pipes were found beneath the narrow streets.
这座城市甚至还敷设过排水系统，因为在窄窄的街道底下发现了许多陶土制的管道。
The drainage system has been aged.
排水系统已经老化了。
drainage详细解释
drain.age n.（名词）The action or a method of draining.排水：排水的行动或方法A system of drains.排水系统Something that is drained off.排走物：被排走的东西Medicine The removal of fluid or purulent material from a wound or body cavity.【医学】 排除：伤口或体腔中液体或脓的排除
