名词
中文翻译：重质原油
同义词：
['heavy crude oil', 'heavy oil例句：1. The refinery is producing extra-heavy crude oil for export.（该炼油厂正在生产出口的重质原油。）']
例句：
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1. The refinery is producing extra-heavy crude oil for export.
该炼油厂正在生产出口的重质原油。
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2. The heavy crude oil has a higher market value than the light crude oil.
重质原油的市场价值高于轻质原油。
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3. The extra-heavy crude oil is difficult to process and requires special equipment.
重质原油难以处理，需要特殊的设备。