释义
adverb & adjective
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。
