1. Till the rivers flow upstream, till lovers cease to dream, till then , I'm yours; be mine. 我将是属于你的，直到河川逆流，直到情侣们放弃梦想；成为我的爱人吧。
2. A check valve that controls fluid flow rates to maintain a predetermined, constant pressure upstream from the valve. 为保持阀的上游的预定不变的压力所用的控制流体流量的一种止回阀。
3. When a company acquires competitors or moves upstream or downstream, its aim is to capture a higher percentage of supply chain value. 当一家公司收购竞争对手或移动上游或下游，其目的是要捕捉一个更高百分比的供应链价值。
英英解释
adj.
1. in the direction against a stream's current
2. toward the source or against the current
