upstream

向上游、逆流而上

We paddled upstream for almost two hours before stopping to rest.

我们逆流而上划了将近两个小时才停下来休息。

在上游

The factory sits a few kilometers upstream from the village.

那间工厂位在村子上游几公里处。

上游的、逆流的

The upstream stretch of the river is much cleaner than here.

这条河上游那一段比这里干净多了。

上游的商业

The company is expanding into upstream oil exploration this year.

该公司今年正往石油探勘等上游事业扩张。

源头的、根本的比喻

We need to tackle the upstream causes of poverty, not just the symptoms.

我们必须处理贫穷的根本原因，而不只是表面问题。