名词
中文翻译：硬活塞
同义词：
['stiff rod', 'stiff piston rod']
例句：
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1.The car's engine is running smoothly with a stiff piston.
汽车的发动机运行平稳，使用硬活塞。
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2. The mechanic replaced the old piston with a new one to improve performance.
机械师更换了旧活塞以改善性能。
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3. During the startup process, the piston needs to be pushed back and forth several times to ensure it is properly seated.
在启动过程中，活塞需要被来回推动几次以确保正确安装。