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简介：The first Hongyi cannons of the Ming Dynasty were purchased from the Portuguese. Because the price was too high and the distance was too long to be transported, the Ming court made up its mind to imitate them. However, the initial imitation was not smooth, and the cannons often exploded. For this reason, Tang Ruowang specially purchased a batch of Fujian iron and Western iron. It was at that time that he met Zhao Jingzhi.