upstreamadj.上游的；逆流而上的adv.向上游；逆流地upstream cofferdam上游围堰upstream operations[经] 上游作业upstream crime rang上游犯罪upstream economizer逆流式省煤器upstream reservoirs上游建库upstream enterprise上游企业upstream water line上游水位线upstream resistance上游(气道)阻力upstream monopolist上游垄断upstream industries上游工业