“上游”造句

这些障碍物对于想要往上游游动的鱼儿来说是致命的。
The barriers are lethal to fish trying to swim upstream.

他在那里有一栋房子，但在河上游几英里处。
He has a house down there but it's miles up river.

上游的城市将污水排放到河里。
Cities upstream use the river to get rid of sewage.

• #上游