axial plunger pump

例句：

1. 1. The machine has an axial drive system.
   这台机器有一个轴驱动系统。
2. 2. The axis of the planet revolves around the sun.
   行星的轴线绕太阳旋转。
3. 3. The axial symmetry of the structure is important for its function.
   结构的轴对称性对它的功用很重要。