ADV [ADVERB after verb] [beADVERB]顺流而下;向(或在)下游方向 Something that is moving downstream is moving towards the mouth of a river, from a point further up the river. Something that is downstream is further towards the mouth of a river than where you are. 顺流而下;向(或在)下游方向 [Also + of/from]
We had drifted downstream.
我们漂向了下游。
...a district called Lupitu, which in fact was downstream of the dam.
叫勒普顿的地区,实际上在大坝的下游。
Communities downstream have been alerted.
下游的社区已经接到了预警。
Downstream is also an adjective.
Breaking the dam could submerge downstream cities such as Wuhan.