moving or situated in the opposite direction from that in which a stream or river flows; nearer to the source
逆流而上(的),在上游(的),往上游(的)
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[as adv.]
a lone motor cruiser rumbled upstream 一艘孤零零的摩托游艇隆隆地逆流而上
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[as adj.]
the upstream stretch of the Nene .尼恩河的上游段。
【生】 (基因序列)上游的。
at a stage in the process of gas or oil extraction and production before the raw material is ready for refining
(炼油、气等过程)上游的,上流的。