upstream
adv. 向（在）上游；逆流地
adj. 向（在）上游的；逆流而上的
例句
The falls upstream are full of salmon.
上游瀑布一带盛产鲑鱼。
《牛津词典》
We'll go to the upstream side of that big rock.
我们将去那块大岩石的上游一侧。
《柯林斯英汉双解大词典》
Salmon manage to swim upstream to lay their eggs.
三文鱼设法游到上游产卵。
