internal grinding machine

例句：

1. 1. The internal grinding machine is used to grind metal parts.
   内部研磨机用于磨金属部件。
2. 2.The engineers developed a new type of internal grinding machine for the factory.
   工程师们为工厂开发了一种新型的内部研磨机。
3. 3.The internal grinding machine was used to remove rust from the old car body.
   内部研磨机被用来去除旧汽车车身的锈迹。