名词
中文翻译：重油馏分
同义词：
['heavy oil', 'heavy oil fractions例句：1. The extraction process involves separating the heavy oil from the lighter fractions.（提取过程涉及将重油从较轻的馏分中分离出来。）']
例句：
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1. The extraction process involves separating the heavy oil from the lighter fractions.
提取过程涉及将重油从较轻的馏分中分离出来。
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2.The heavy oil is used in the production of lubricants and fuels.
重油被用于生产润滑油和燃料。
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3.The heavy oil fractions are more difficult to refine than their lighter counterparts.
与较轻的馏分相比，重油馏分更难以精炼。