名词
中文翻译：重油
同义词：
['heavy fuel oil', 'heavy lubricating oil']
例句：
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1. Theheavy-duty oil is used in the machinery to reduce friction and increase efficiency.
这种重油被用于机械中，以减少摩擦并提高效率。
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2. The heavy-duty oil helps to protect the engine from overheating.
这种重油有助于保护发动机免受过热。
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3. The heavy-duty oil is a crucial component in the maintenance of heavy machinery.
这种重油是重型机械维护中至关重要的组成部分。