plane of direction

例句：

1. 1. The car wasdriving straight towards the plane of direction.
   汽车直直地朝方向平面驶去。
2. 2. Thepilot adjusted his course to follow the planeof direction.
   飞行员调整航线以遵循方向平面。
3. 3.The map showed the plane of direction clearly.
   地图清晰地显示了方向平面。