gas ballast air

例句：

1. 1. The ship's engine needs a certain amount of gas ballast air to maintain stability.
   这艘船的引擎需要一定量的气体浮力空气来维持稳定性。
2. 2. During the launch, the pilot carefully controlled the gas ballast air to ensure smoothtakeoff.
   在发射过程中，飞行员小心翼翼地控制了气体浮力空气，以确保平稳起飞。
3. 3. The aircraft's cabin was filled with gas ballast air to provide a comfortable environment for passengers.
   飞机的客舱充满了气体浮力空气，为乘客提供了一个舒适的环境。