trace metal impurities

• 痕量金属杂质

trace metal impurities的用法和样例：

例句

1. Introduction of metal impurity into TiO_2 to improve the photocatalytic activity of TiO_2 has been studied widely.
   在二氧化钛中引入金属杂质以提高二氧化钛的光催化活性受到人们的广泛研究。
2. Advanced manufacturing processes are applied and the content of metal impurity is rigorously controlled.The oxidant is reduced to the minimum extent in each manufacturing process.
   采用先进制程并严格控制金属杂质的含量，并在每一制程中将氧化物降至最低程度。