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.
但尽管大型石油公司纷纷希望摆脱下游资产，但买家却是众里难寻。
Since many major oil companies are looking to get rid of assets downstream, it can be tough to find buyers.
作为石油下游产品公司，中石化处理大多数进口原油。
As a downstream company, it processes mostly the imported crude oils.
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