名词
中文翻译：内筒
同义词：
['inner tube', 'inner core例句：1. The inner cylinder of the car is where the engine sits.（汽车的内筒是发动机所在的地方。）']
例句：
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1. The inner cylinder of the car is where the engine sits.
汽车的内筒是发动机所在的地方。
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2.The inner cylinder of the bicycle has a smooth surface for easy riding.
自行车的内筒表面光滑，便于骑行。
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3. The inner cylinder of the machine is made of metal and is used to contain the moving parts.
机器的内筒由金属制成，用于容纳移动部件。