名词
中文翻译：外部润滑
同义词：
['external grease', 'external lubricant例句：1. The machine needs to be lubricated regularly to ensure smooth operation.（这台机器需要定期润滑，以确保顺畅运行。）2. Lubricating oil is used to reduce friction between moving parts of a machine.（润滑油被用来减少机器移动部件之间的摩擦。）']
例句：
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1. The machine needs to be lubricated regularly to ensure smooth operation.
这台机器需要定期润滑，以确保顺畅运行。
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2. Lubricating oil is used to reduce friction between moving parts of a machine.
润滑油被用来减少机器移动部件之间的摩擦。
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3.In the field of mechanical engineering, external lubrication plays a crucial role in reducing wear and extending the life of machinery.
在机械工程领域，外部润滑在减少磨损和延长机械设备使用寿命方面起着至关重要的作用。