gear and spline rolling machines

例句：

1. 1.These gear and spline rolling machines are used for precision machining.
   这些齿轮和花键滚动机用于精密加工。
2. 2. The gear and spline rolling machines are crucial for the production process.
   齿轮和花键滚动机对于生产过程至关重要。
3. 3. The gear and spline rolling machines are used to produce high-precision components.
   齿轮和花键滚动机用于生产高精度组件。