名词短语
中文翻译：油脂的硬度
同义词：
['friction', 'hardness', 'lubricity']
例句：
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1.The engine oil needs to be replaced after a certain period of use.
发动机油在使用一段时间后需要更换。
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2. The car's engine oil is hardness of grease.
汽车的发动机油是油脂的硬度。
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3. Lubrication is essential for reducing friction and increasing the hardness of grease.
润滑对于减少摩擦和增加油脂的硬度至关重要。