iron alloy

例句：

1. 1. The steelalloy is used in the construction ofbridges and buildings.
   这种铁合金用于桥梁和建筑的建设。
2. 2. The alloy hasa high strength and low density, makingit ideal for use in aircraft engines.
   这种合金具有高强度和低密度，使其非常适合用于飞机发动机。
3. 3. The iron alloywas developed to improve the durability of thematerial.
   这种铁合金的开发是为了提高材料的耐用性。