名词
中文翻译：油膜浓度
同义词：
['oil film concentration', 'oil film thickness', 'oil film coverage']
例句：
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1. The grease on the cutting tool is causing a problem.
切削工具上的油脂导致了一个问题。
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2. The engineer used a special grease to lubricate the gears.
工程师使用一种特殊的油脂来润滑齿轮。
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3.The grease was spread evenly across the surface of the machine.
油脂均匀地涂抹在机器的表面。