名词
中文翻译：上部气缸润滑
同义词：
['upper cylinder lubrication', 'upper cylinder lubricating']
例句：
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1. The engine's upper cylinder lubrication is critical for its smooth operation.
发动机的上部气缸润滑对于其顺畅运行至关重要。
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2.During maintenance, it's important to ensure proper lubrication of the upper cylinder.
在维护过程中，确保上部气缸得到适当润滑是很重要的。
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3.The engineer inspected the lubrication system and found that the upper cylinder was not functioning properly.
工程师检查了润滑系统，发现上部气缸没有正常工作。