raceway grinder

例句：

1. 1. The raceway grinder is used to remove rust from metal surfaces.
   轨道研磨机用于从金属表面去除锈迹。
2. 2. The engineer used a grinder to smooth the rough edges of the machine parts.
   工程师使用研磨机来平滑机器零件的粗糙边缘。
3. 3. The grinder was used to polish the surface of the glass before it was coated with a protective layer.
   研磨机被用来在玻璃表面涂上保护层之前进行抛光。