granulated iron powder

例句：

1. 1. The engineer used granulated iron powder to make the machine work more efficiently.
   工程师使用粒状铁粉使机器工作得更有效。
2. 2. Granular iron powder is a common material used in industrial processes.
   粒状铁粉是一种常见的工业原料。
3. 3.The granular iron powder was used as a catalyst in the chemical reaction.
   粒状铁粉作为催化剂用于化学反应中。