minimum angle of elevation

例句：

1. 1. The airplane's minimum angle ofelevation is 45 degrees.
   飞机的最小仰角是45度。
2. 2. Theengineer calculated the minimum angle of elevation forthe bridge.
   工程师计算了桥梁的最小仰角。
3. 3. The pilot adjusted the aircraft's altitude to maintain a minimum angle ofelevation.
   飞行员调整了飞机的高度，以保持最小仰角。