noun🔗Share内胎，里胎。 In a pneumatic tire, the rubber liner that holds the air."The bicycle tire was flat because the innertube had a hole in it. "自行车胎没气了，是因为里面的内胎破了个洞。materialvehicleparttechnologyChat with AIVocabulary GamePractice Reading
noun🔗Share内胎，浮圈。 This rubber liner, used without the tire on water as a flotation aid."We used an innertube to float down the lazy river at the water park. "我们用水上乐园的内胎/浮圈在漂流河上漂流。materialaidsportnauticalChat with AIVocabulary GamePractice Reading
