upstreamadj.上游的；逆流而上的adv.向上游；逆流地upstream deposit河流上流沉积upstream shipping上水航行upstream promoter上游启动子upstream exchange上级交换局upstream supplier上游供应商upstream business上游业务upstreamcofferdam上游围堰upstreaminjection逆流喷射upstream deposits上游沉积物upstream pressure进口压力,上游压力