名词
中文翻译：主活塞衬套
同义词：
['main bearing', 'main bearingbushing']
例句：
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1. Theengine needs to be replaced with a newmain piston bushing.
发动机需要用新的主活塞衬套来更换。
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2. Mainpiston bushings are essential for maintainingthe smooth operation of the engine.
主活塞衬套对于保持发动机平稳运行至关重要。
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3.The mechanic replaced the main piston bushing and checked the oil level.
机械师更换了主活塞衬套，并检查了油位。