iron group

例句：

1. 1. The steel industry is heavily dependent on the production of iron and steel.
   钢铁工业严重依赖于钢铁的生产。
2. 2. The researchers found that the iron group had a significant impact on the environment.
   研究人员发现，这个铁合金组对环境产生了重大影响。
3. 3. The iron group was responsible for the development of modern technology.
   这个铁合金组负责了现代技术的开发。