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简介：On April 17, the twelfth year of Chongzhen, Sinmin and his younger brother traded with the Mongols a hundred miles away from Zhangjiakou. They left with sixty carts and came with six carts, all of which were gold and silver. Caravans from the Fan family, the Wang family, the Jin family, and the Zhai family came in an endless stream, but it was the Fan family that made the most profit, because the Fan family's goods contained the Fujian iron and sulfur that Jianlu needed most.