flap angle

例句：

1. 1. The bird's flap angle is crucial for its flight efficiency.
   鸟的翼展角度对其飞行效率至关重要。
2. 2.The airplane's wingspan is measured in meters, while the span of a human arm is much shorter.
   飞机的翼展长度以米为单位，而人类手臂的跨度要短得多。
3. 3. The pilot adjusted the flap angle to optimize fuel efficiency.
   飞行员调整了翼展角度以优化燃油效率。