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1. Oxford American Dictionary

   inner tube

   • IPA[ˈinər ˌto͞ob]

   美式

   • n.
     a separate inflatable tube inside a pneumatic tire.；a large inflatable circular tube for riding on water or snow

   • noun: inner tube, plural noun: inner tubes

2. • 釋義

   n.

   名詞

   • 1. a separate inflatable tube inside a pneumatic tire.
   • ▪ a large inflatable circular tube for riding on water or snow we cruised down the river on inner tubes