名词
中文翻译：内筒
同义词：
['inner chamber', 'innertube', 'inner space']
例句：
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1. The inner barrel of the car iswhere the engine sits.
汽车的内筒是发动机所在的地方。
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2. The inner barrel ofthe cannon was filled with gunpowder.
大炮的内筒被火药填满了。
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3. The inner barrel of the pipe iswhere the smoke goes down.
烟斗的内筒是烟往下走的地方。