ferratinum

例句：

1. 1. The iron powder is used as a catalyst in the chemical industry.
   铁粉用作化学工业中的催化剂。
2. 2. The iron powder was mixed with water to make a paste.
   将铁粉与水混合制成糊状物。
3. 3. The iron powder was used to coat the surface of the metal to prevent rust.
   使用铁粉涂覆金属表面以防锈蚀。