top main plane

例句：

1. 1. The engineer carefully inspected the top main plane of the aircraft before taking off.
   工程师在起飞前仔细检查了飞机的顶部主平面。
2. 2.During the flight, the pilot had to make adjustments to the top main plane to maintain stability.
   飞行过程中，飞行员需要调整顶部主平面以保持稳定性。
3. 3. The top main plane is where most of the weight is distributed during takeoff and landing.
   顶部主平面是起飞和降落时大部分重量分布的地方。