axial focusing

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 revolves around the sun.
   行星的轴线围绕太阳旋转。
3. 3.The axis of the Earth is tilted at a slight angle to the plane of the orbit.
   地球的轴线略微倾斜，与轨道平面成一定角度。