airspace paper core cable

例句：

1. 1.The airplane needs to maintain an airspace of at least 100 feet above the ground.
   飞机需要保持至少100英尺高的空中空间。
2. 2.The pilot had to navigate through the airspace between two mountain ranges.
   飞行员必须导航穿过两个山脉之间的空中空间。
3. 3. The spacecraft was designed to travel in a specific airspace for safety reasons.
   太空船被设计成在特定的空中空间旅行，出于安全原因。