168极速赛车怎么看走势图技巧

简介：In the middle and late Ming Dynasty, due to the victory in the perennial war against Mongolia, Mongolia formally professed its vassalage to the Ming Empire, and the trade channel with Mongolia was opened. The Ming Dynasty officials could purchase cheaper horses from Mongolia in large quantities, so they stopped domestic private purchases. Horses have caused private horse farms in Hebei and Shandong to close down and change careers.