permanent axis

• 恒轴线

permanent axis的用法和样例：

例句

1. The force is applied perpendicularly to the load beams axis.
   力要垂直作用在测压梁的轴线上。
2. Cascading access to all levels are placed at the ends of this axis.
   到各层的入口设置于轴线的尽端。