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中国古代许多封建王朝在建立统一的政权后,为了解决与北方草原游牧民族之间的冲突,往往都要在北边筑起长城,这在冷兵器的时代是抵御草原骑兵侵扰的最有效的防御设施。历史上,从春秋战国诸侯国修筑长城起到秦汉、北魏、北齐、金都在不断地修筑长城。尤其是到了明代,更是进行了规模浩大的修筑工程。如果把历代修筑的长城里数相加,长度已超过10万里。
After the establishment of a unified political power in many ancient Chinese feudal dynasties, in order to resolve the conflict with nomadic northern nomads, it is often necessary to build the Great Wall on the north. This is the most effective defensive facility in the era of cold weapons against invaders of grassland cavalry . Historically, from the Spring and Autumn and Warring States to build the Great Wall of the Great Wall played the Qin and Han Dynasties, the Northern Wei Dynasty, Northern Qi, Jin are constantly building the Great Wall. Especially to the Ming Dynasty, it carried out a vast construction project. If we add together the number of the Great Wall built over the past, the length has more than 100,000 miles.