main spindle box的用法和样例：
例句
- Spindle feeds and speeds are controlled by selector levers which engage the proper gears in the drill head.
主轴的进能量和转速是通过选速杆使主轴箱中的适当齿轮相啮合而控制的。 - Finally headstock's solid state frequency is big, is mainly the main electrical machinery, the second-level decelerator and the box body vibrates in a big way.
结果主轴箱的固态频率较大，主要是主电机，二级减速箱和箱体振动较大。
