大小单双是什么赌博

简介：Liang Yizhang put forward two points. First, the future border trade of Zhangjiakou should be divided into two cities, the inner and outer cities. The outer market should be placed in Zhangjiakou Fort, and only barter is allowed. The two parties to the transaction are Ming and Mongolian merchants; the inner market should be placed in Xuanhua The city mainly trades gold and silver, and both parties to the transaction can only be Ming merchants.