effluent
/ˈefluənt; `ɛflʊənt/ n
1 [U, C] (discharge of) liquid waste matter, sewage, etc, eg from a factory into a river 废液、 污水等（的排放）（如从工厂排到河流）
The effluent from the factory makes the river unsafe for swimming. 工厂放出的废水把这条河弄得不能游泳了.
2 [C] stream flowing from a larger stream or from a lake （从河或湖中流出的）支流, 小水流.