secondary alloy

例句：

1. 1.The steel is a secondary alloy of iron and carbon.
   这种钢是铁和碳的次级合金。
2. 2.The alloy has excellent wear resistance and corrosion resistance.
   这种合金具有极好的耐磨性和耐腐蚀性。
3. 3.The manufacturing process involves adding small amounts of other metals to the primary alloy to improve its properties.
   制造过程包括向主要合金中添加少量其他金属以改善其性能。