axial filament

例句：

1. 1. The machine isaxially driven by a motor.
   这台机器由一个电动机轴向驱动。
2. 2. Theaxis of the planet revolves around thesun.
   行星的轴心围绕太阳旋转。
3. 3.The axis of symmetry is perpendicular to the plane of the figure.
   对称轴垂直于图形平面。