upstream

'ʌp'stri:m

Collins 1

a. in the direction against a stream's current

adv. 向上游, 逆流地
a. 向上游的, 逆流而上的

Collins 星级

12,214

BNC 频率

11,313

使用频率

upstream 由 up（向上）和 stream（溪流、河流）组成，字面意思是“向上游”，表示水流的方向。

例句

1. The salmon swim upstream to lay their eggs.

鲑鱼逆流而上产卵。

2. The factory is located upstream from the river, so it doesn't pollute the water.

这家工厂位于河流的上游，因此不会污染水源。

3. We need to find the source of the pollution upstream.

我们需要找到上游污染的源头。