auxiliary propeller

例句：

1. 1. The auxiliarypropeller was designed to improve the efficiencyof the main propeller.
   辅助螺旋桨的设计旨在提高主螺旋桨的效率。
2. 2. During theflight, the auxiliary propeller was used to maintain altitude and stabilizethe aircraft.
   飞行中，辅助螺旋桨被用来保持高度和稳定飞机。
3. 3. Theauxiliary propeller was responsible forproviding additional thrust during takeoff and landing.
   辅助螺旋桨负责在起飞和降落时提供额外的推力。