powdered carborundum

例句：

1. 1. The engineer used this powdered carborundum to polish the machine parts.
   工程师用这种粉末金刚砂来抛光机器零件。
2. 2. The powdered carborundum is used as an abrasive for grinding and polishing purposes.
   粉末金刚砂被用作研磨和抛光的磨料。
3. 3.In the manufacturing process, powdered carborundum is often mixed with water to create a paste that can be applied to surfaces for smoothening.
   在制造过程中，粉末金刚砂经常与水混合成糊状物，可以涂抹在表面以实现平滑效果。