multiple spline hub

例句：

1. 1. The machine has a multiple spline hub that allows for easy adjustment of the gear ratio.
   这台机器有一个多级插接式轴承座，可以轻松调整齿轮比。
2. 2.The design of this part is optimized to reduce vibration and improve efficiency in the manufacturing process.
   这种零件的设计优化了制造过程中的振动减少和效率提高。
3. 3. The multiple spline hub is crucial for ensuring smooth operation of the machine, as it helps to distribute the load evenly across the entire assembly.
   多级插接式轴承座对于确保机器平稳运行至关重要，因为它有助于将负载均匀地分布在整个装配体上。