recirculated iron

例句：

1. 1. The steel mill uses recycled iron to produce new steel products.
   这家钢铁厂使用再生铁生产新的钢材产品。
2. 2.Recycling is an important way to reduce the amount of waste in our environment.
   回收是减少我们环境中废物的重要方法。
3. 3.The company aims to use recirculated iron to improve energy efficiency.
   该公司致力于使用循环铁来提高能源效率。