spheric iron particle

例句：

1. 1. The scientist found a spheric iron particle in the sample.
   科学家在样本中发现了球形铁粒。
2. 2. The engineer used a spheric iron particle to reinforce the structure.
   工程师使用球形铁粒来加固结构。
3. 3. The researcher discovered that spheric iron particles can be used as a catalyst.
   研究者发现球形铁粒可以作为催化剂。