名词
中文翻译：活塞保护环
同义词：
['piston ring', 'cylinder ring', 'piston ring', 'cylinder ring', 'piston ring', 'cylinder ring']
例句：
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1. The piston guard ring helps to protect the engine from wear and tear.
活塞保护环有助于保护发动机免受磨损。
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2. The piston guard ring is designed to prevent the piston from moving out of the cylinder.
活塞保护环的设计目的是防止活塞从气缸中移动出来。
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3.The piston guard ring is a crucial component in the engine's operation.
活塞保护环是引擎运行的关键部件。