上中下游一体化发展格局 – integrated development in the upper; middle and lower reaches of the Yangtze River
在石油行业，通常按照河流区域的划分，将石油公司划分为上游、中游和下游。
Within the industry, different parts of oil companies are descried as sections of a river: upstream, midstream and downstream.
正如名字所示，中游的公司处在上游开采原油和天然气的公司和下游分销产品的公司之间。
As the name suggests, midstream companies sit between upstream companies which actually extract the oil or natural gas and downstream companies which distribute the commodity.
每条河流都有上游、中游、下游。
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