名词
中文翻译：管中管
同义词：
['tube inside tube', 'inner tube', 'inner tubes例句：1. The inner tubes are the crucial components of the bicycle frame.（内胎是自行车框架的关键组成部分。）']
例句：
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1. The inner tubes are the crucial components of the bicycle frame.
内胎是自行车框架的关键组成部分。
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2. The inner tubes were designed to provide extra protection for the rider.
内胎的设计是为了为骑手提供额外的保护。
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3. The inner tubes need to be replaced regularly to ensure proper functioning.
内胎需要定期更换，以确保正常工作。