emery grinding stone

例句：

1. 1.The emery grinding stone is used to polish the metal surface.
   金刚石磨石用于打磨金属表面。
2. 2. This emery grinding stone is very effective in removing scratches from glass.
   这种金刚石磨石在去除玻璃划痕方面非常有效。
3. 3.The emery grinding stone was a valuable tool for the ancient artisans.
   金刚石磨石是古代工匠们宝贵的工具。