metallic addition

例句：

1. 1. The steel manufacturer added a new alloy to improve its strength.
   这家钢铁制造商加入了一种新的合金以提高其强度。
2. 2.The engineer found that the addition of water could reduce the temperature of the mixture.
   工程师发现加入水可以降低混合物的温度。
3. 3.The scientist conducted an experiment to determine the effect of different metal additives on the corrosion resistance of the material.
   科学家进行了一个实验，以确定不同的金属添加剂对材料耐腐蚀性的影响。