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人们平常所说从山海关到嘉峪关的长城是指明长城,而中国还有春秋、战国、秦、汉、清等多个朝代修筑的长城,这些长城广泛存在于中国北方,包括山东的齐长城、辽东长城等。它不仅指城楼,还由关隘、城堡、墙体、烽燧等子系统相互联系,按特定结构方式组合而成,是具有防御功能作用的有机整体。
It is commonly said that the Great Wall from Shanhaiguan to Jiayuguan is the Great Wall of the Ming Dynasty, while China also has the Great Wall built by the dynasties of Spring and Autumn, the Warring States, Qin, Han and Qing dynasties. These Great Walls exist widely in northern China, including Qi Changcheng in Shandong and Liaodong Great Wall and so on. It not only refers to the watchtower, but also by pass, castle, wall, Feng Sui and other subsystems linked to each other, according to a combination of specific structures, is a defensive function of the organic whole.