nul·lah
noun/ˈnʌlə/
/ˈnʌlə/
(also nala)
(Indian English)- a stream, an artificial channel for water, a river bed (= an area of ground over which a river usually flows), or a deep, very narrow valley with steep sides
明渠：一条河，一条人造的水道，一条河床（一条河流通常在其上流过的地面区域）或一个深而狭窄的山谷，两边陡峭