地处我国传统的农牧交错带之上的永定河流域,随着北京作为军事重镇、尤其是近千年来成为国家的政治中心,往往同时成为不同民族、不同政权军事冲突的战场,正所谓“人世难逢开口笑,上疆场彼此弯弓月,流遍了,郊原血”。永定河流域发生了许多被载入 With the traditional agricultural and pastoral ecotone in China, the Yongding River basin, with Beijing as a military town, especially as the political center of the country for nearly a thousand years, often simultaneously becomes the battlefield for military conflicts of different nationalities and different regimes. The so-called “Life is hard to meet, laugh on each other, bow on the battlefield on the battlefield, flow all over, suburbs of the original blood.” Much happened in Yongding River Basin