名词
中文翻译：备用活塞
同义词：
['spare cylinder', 'spare cylinder block']
例句：
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1.The spare piston was used to replace the damaged one.
备用活塞被用来替换损坏的。
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2. The car's engine is designed with a spare piston for emergency repairs.
汽车引擎设计有备用活塞，用于紧急维修。
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3. During maintenance, the mechanic replaced the spare piston with a new one.
在维护期间，机械师用一个新的备用活塞替换了旧的。