名词
中文翻译：活塞
同义词：
['piston', 'cylinder piston']
例句：
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1.The engine's performance is greatly improved by the new design of the trunk piston.
新设计的发动机通过改进的活塞设计性能大大提高。
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2. The car's engine was replaced with a new one due to the worn out trunk piston.
由于活塞磨损，这辆汽车的发动机被更换了。
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3.The engineer carefully inspected the condition of the trunk piston before starting the engine.
工程师在启动发动机之前仔细检查了活塞的状况。