air void

例句：

1. 1. The scientist found an air void in the chamber.
   科学家在实验室里发现了一个空气空隙。
2. 2. The spacecraft was designed to travel through air voids.
   这个宇宙飞船被设计用来穿越空气空隙。
3. 3.The physicist used a vacuum pump to create an air void.
   物理学家使用真空泵来制造一个空气空隙。