aircraft flying height

例句：

1. 1.The aircraft flying over the city is a symbol of modern technology.
   正在城市上空飞行的飞机是现代科技的象征。
2. 2.The pilot must maintain a safe altitude to avoid collisions with other aircraft.
   飞行员必须保持安全高度以避免与其他飞机相撞。
3. 3. The height of the aircraft is determined by its wingspan and the airspeed it can achieve.
   飞机的高度由其翼展和它能达到的最大速度决定。