Chapter 1571: Sudden Visit

o idea that combining pyrite and coke in a limited-air environment can produce sulfur.She knew this technology. Now, all that was needed was to secretly find a sulfur mine and then secretly send peopl...g and spoke sincerely, "Sister-in-law, thank you."An Xuetang nodded slightly, "You're welcome."Mo Yunjing's lips curled into a faint smile, and he dotingly raised his hand to ruffle An Xuetang's head....