三期必中简介：Zhao Zhi shook his head: "I don't know, but I heard from Fo Langji that Western fine iron must be made from Western coal and iron ore. The same effect cannot be achieved with Ming Dynasty coal and ore."
Zhao Zhi shook his head: "I don't know, but I heard from Fo Langji that Western fine iron must be made from Western coal and iron ore. The same effect cannot be achieved with Ming Dynasty coal and ore."
