axial air section

例句：

1. 1. The machine has an axial screw for easy adjustment.
   这台机器有一个轴向的螺丝便于调整。
2. 2. The axis of the planet is perpendicular to its orbit.
   行星的轴线垂直于其轨道。
3. 3. The axis of symmetry is at the center of the object.
   对称轴位于物体的中心。