metallic iron

例句：

1. 1. The metalliciron is used in the construction of buildings.
   这种金属铁用于建筑施工。
2. 2. Steel isstronger than ordinary iron and is often usedfor making tools.
   钢比普通铁更坚固，常用于制作工具。
3. 3. The metallic iron is a good conductor ofheat.
   金属铁是良好的热导体。