名词
中文翻译：活塞
同义词：
['piston', 'cylinder', 'piston ring']
例句：
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1.The engine's piston is worn out.
引擎的活塞磨损了。
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2. The piston rings are essential for keeping the engine running smoothly.
活塞环对于保持发动机平稳运行至关重要。
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3. The technician inspected the piston and found no signs of wear.
技师检查了活塞，发现没有磨损的迹象。