upstream
/ˈʌpˈstriːm/adverb & adjective
1- 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）：
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
as adj. the upstream stretch of the Nene.尼恩河的上游段。
1.1
- Biology situated in or towards the part of a sequence of genetic material where transcription takes place earlier than at a given point【生】（基因序列）上游的。
1.2
- 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。