名词
中文翻译：内杯
同义词：
['inner part', 'inner shell', 'inner tube例句：1. The car had a broken inner cup and needed to be repaired immediately.（这辆车的内杯破了，需要立即修理。）']
例句：
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1. The car had a broken inner cup and needed to be repaired immediately.
这辆车的内杯破了，需要立即修理。
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2. The inner cup of the bicycle is where the brakes are located.
自行车的内杯是刹车的位置。
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3. The inner cup of the balloon was filled with air before it was inflated.
气球的内杯在充气前已经充满了空气。