Low Phosphorus Pig lron Smelting

• 低磷生铁冶炼

Low Phosphorus Pig lron Smelting的用法和样例：

例句

1. According to records, as early as the Spring and Autumn Period, there are mining and smelting of pig iron.
   据记载，早在春秋时期，就有矿业开采与生铁冶炼。