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官厅水库是根治永定河工程的重心。这个水库,是我国目前所建水库中最大的一个。永定河流经察哈尔、河北两省,到天津附近的屈家店附近和北运河
Guanting Reservoir is the center of cure the Yongding River project. This reservoir is the largest one currently built in our country. The Yongding River flows through Chahar and Hebei provinces to nearby Qujiadian near Tianjin and the North Canal