名词
中文翻译：活塞环行程
同义词：
['piston ring stroke', 'piston ring travel distance']
例句：
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1. Thepiston rings are designed to reduce friction and improve engine efficiency.
活塞环的设计旨在减少摩擦并提高发动机效率。
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2.During the piston ring travel, the cylinder walls are pushed apart by the expanding gases.
在活塞环行程期间，气缸壁被膨胀的气体推开。
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3. The piston rings need to be replaced regularly to ensure smooth operation of the engine.
定期更换活塞环以确保发动机平稳运行。