secondary shaft

例句：

1. 1. The machine's main shaft is broken, so we have to replace it with a secondary shaft.
   机器的主轴断了，所以我们不得不用一个次级轴来代替。
2. 2. The car has an auxiliary shaft that allows the driver to switch between manual and automatic gears.
   这辆车有一个辅助轴，可以让司机在手动和自动档之间切换。
3. 3. The engineer used a special tool to remove the secondary shaft from the machine.
   工程师使用一种特殊的工具从机器中取出了次级轴。