试探气球

例句：

1. 1. They tried to launch the rocket using a blimp as a test balloon.
   他们试图用一个飞艇作为试验气球来发射火箭。
2. 2. The blimp was used to test the new airbag system in the car.
   这个飞艇被用来测试汽车中的新气囊系统。
3. 3. The blimp was used to collect data on the weather conditions during the flight.
   这个飞艇被用来收集飞行期间的天气数据。