controllable pitch airscrew

例句：

1. 1. The aircraft's controllable pitch airscrew is essential for maintaining stability during takeoff and landing.
   飞机的可控制转速螺旋桨对于起飞和降落期间保持稳定性至关重要。
2. 2.The engineer adjusted the controllable pitch airscrew to optimize fuel efficiency.
   工程师调整了可控制转速螺旋桨以优化燃油效率。
3. 3. The pilot had to make quick adjustments to the controllable pitch airscrew to avoid collision with an unseen obstacle.
   飞行员必须迅速调整可控制转速螺旋桨以避免与一个未被发现的障碍物相撞。