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简介：The formation of the Tianjin area began with the opening of the Grand Canal in the Sui Dynasty. After the middle of the Tang Dynasty, Tianjin became a land and water terminal for transporting grain and silk from the south to the north. It was called Zhigu Village in the Song and Jin Dynasties, and was renamed Haijin Town in the Yuan Dynasty. It was an important military town and a grain transshipment center.