1)downhill,下坡(路的)，下倾的，衰退2)A descending slope, as in a road.,下坡路等的下坡3)down hill,下坡的，倾斜的4)downgrade,下坡，衰落(的)，降级5)decline of subsurface flow,地下水流的衰退6)downslope,下坡;下坡的
用法和例句
The decline of subsurface flow in soil slope due to rainfall infiltration has been studied with numerical analysis.