removal effect of nitrogen

• 脱氮效果

removal effect of nitrogen的用法和样例：

例句

1. The effect of Re element addition on the nitrogen content in the weld was insignificant due to the oxidization from the early deoxidization stage.
   而由于稀土元素在先期脱氧中大量氧化，其脱氮效果较弱，稀土元素对熔敷金属的总含氮量的影响不显著。