Chapter 91: Papermaking Ice-Making Method

er, Yang Lin shook his head and said: "What you said is saltpeter, saltpeter can be used as medicine, but this kind of stone, called fire saltpeter!""Fire powder" Liao Hongying asked curiously, "What... Li Yuyao knows, building a house These two words are too humble!According to Yang Lin's previous description, the so-called second phase project was simply a prototype of building a city!The next day...