alloy firm

例句：

1. 1. The steel is made from a mixture of iron and carbon, which makes it stronger than pure iron.
   这种钢是由铁和碳混合制成的，比纯铁更坚固。
2. 2. Alloys are used in various industries to improve their properties.
   合金被用于各种工业中以改善其性质。
3. 3. The car was made from an alloy of aluminum and copper.
   这辆车是用铝和铜的合金制成的。