以下为句子列表：
英文: Crude petroleum oil from different oilfields is never exactly identical in composition.
中文: 产自不同油田的原油在成份上从来就没有完全相同过。
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英文: Industrial Products: crude petroleum products, petrochemical products.
中文: 主要工业产品：原油制品、石油化工产品。
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英文: The starting materials for the petrochemical industry are obtained from crude petroleum in one of two general ways.
中文: 石化工业的初始原料大概通过一到两种方法从原油中提取。
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