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简介：Because Japan is rich in sulfur and copper, both of which are poor resources for the Ming Dynasty. Sulfur is a necessity for making gunpowder. Copper can be used to make cannons and money. The more of these two things will be better for the Ming Dynasty. Zhu Cixiang wants to use Zheng Zhilong’s caravan from Japan Buy a lot - Zheng Sen’s mother is Japanese, and his Zheng family has deep connections in Japan.