一倍流水怎么算

简介：The sea ban was an ancestral system of the Ming Dynasty. Although the Longqing switch opened a crack and Quanzhou Crescent Port was established, becoming the only trading port of the Ming Dynasty. The year before last, in order to cope with the war, with the efforts of Emperor Longwu, the imperial sea ban was slightly opened. It has become a little looser, but overall, it is still more closed than open.