名词
中文翻译：机油
同义词：
['lubricant', 'oil']
例句：
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1.The engine needs to be lubricated regularly to ensure smooth operation.
发动机需要定期润滑以确保顺畅运行。
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2. The car's engine is running smoothly after the oil was changed.
汽车的引擎在换了油之后运行得很平稳。
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3. Lubricants are essential for preventing friction and wear in machinery.
润滑油对于防止机械摩擦和磨损至关重要。