磨光器

例句：

1. 1. This machine is used to polish the surface of metal.
   这台机器用于金属表面的抛光。
2. 2. The engineer needs to sharpen the grinding wheel for the next job.
   工程师需要为下一个工作磨利磨盘。
3. 3. The carpenter uses a grindstone to smooth the wood before it's cut into pieces.
   木匠使用磨石将木材平滑后切割成块。