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。