inside tube

例句：

1. 1.The bike has a shiny new inside tube.
   这辆自行车有一个闪亮的新内管。
2. 2.The engineer used the inside tube to make the car lighter.
   工程师使用内管使汽车更轻。
3. 3.The inside tube was damaged during the accident.
   事故中内管受损。