pitch of propeller

例句：

1. 1. The aircraft's engine is running at its maximum thrust, with a pitch of 20 degrees.
   飞机的引擎正在以最大推力运行，转速为20度。
2. 2.The pilot adjusted the throttle to maintain the optimal pitch for maximum efficiency.
   飞行员调整了油门，以保持最佳的转速，以获得最大的效率。
3. 3. The helicopter was tested at various pitches to ensure it could handle different conditions.
   直升机在不同的转速下进行了测试，以确保它可以应对不同的条件。