airborne gravity measurement

例句：

1. 1.The plane is airborne over the city.
   飞机在城市上空飞行。
2. 2. The pilot had to make an emergency landing due to bad weather conditions.
   由于恶劣天气条件，飞行员不得不紧急着陆。
3. 3.Airborne vehicles are used for transportation and delivery purposes.
   航空器用于运输和配送目的。