inner tube

• 一种柔性的充气橡胶内胎，置于轮胎内部以保持气压；也指类似的可充气内胎，用于在水中漂浮或乘坐雪圈滑行。

A flexible, inflatable rubber tube placed inside a tire to hold air pressure, or a similar tube used for floating in water or recreational tubing.

1. B1formal

   A separate inflatable rubber ring placed inside a pneumatic tire to hold the air pressure.

   内胎

   • He replaced the punctured inner tube on his bicycle.
   • The car's inner tube had a slow leak.
   • Inner tubes are commonly used in bicycle and motorcycle tires.

2. Floating deviceA2informalamerican

   An inflatable ring used for recreation in water, often made from a tire inner tube.

   游泳圈

   • We floated down the river on inner tubes.
   • The kids played with an inner tube at the beach.
   • She bought a colorful inner tube for the pool.