adv.上游，逆流，向(或在)上游
adj.(石油工业等)上游的，溯流而上的

The salmon swim upstream to spawn in the rivers where they were born.
鲑鱼逆流而上，在它们出生的河流里产卵。
We need to find out who is the upstream supplier of this product.
我们需要查明这款产品的上游供应商是谁。
The factory is discharging pollutants upstream, contaminating the water source.
这家工厂在上游排放污染物，污染了水源。
The project was delayed due to issues with our upstream partners.
由于上游合作伙伴的问题，项目被推迟了。
The cost increase is likely to be passed on to consumers downstream, but the real issue lies with the upstream manufacturers.
成本增加可能会转嫁给下游消费者，但真正的问题在于上游制造商。
The software update from the upstream repository fixed several bugs.
来自上游存储库的软件更新修复了几个错误。
The company decided to diversify its supply chain to reduce dependence on a single upstream provider.
该公司决定多元化其供应链，以减少对单一上游供应商的依赖。
The river's upstream region is rich in wildlife and untouched natural beauty.
这条河的上游地区拥有丰富的野生动植物和未受破坏的自然美景。
The oil spill upstream has affected the entire ecosystem downstream.
上游的石油泄漏影响了整个下游生态系统。
Collaboration with upstream stakeholders is crucial for the success of this project.
与上游利益相关者的合作对这个项目的成功至关重要。