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简介：But this year, with the invasion of Jianlu, Tianjin closed the gates and released water at the right time. The water level of the entire North Canal and Tonghui River was pushed up. Even if the canal defense line was lost, Tianjin did not fully open the gates in order to continue to raise the water level. The water level was high to facilitate ships from Tianjin and the capital to rescue Tongzhou.