self-protective metal

• 自保护金属

self-protective metal的用法和样例：

例句

1. A type of self-shield metal cored wire for hardfacing is studied in the paper.
   研制了一种自保护金属芯堆焊药芯焊丝。
2. Oil preserves metal from rust.
   油保护金属免于生锈。