任何事物的产生都是内外因共同作用的结果,西汉长城也不例外。西汉长城修筑的外因是匈奴侵扰,其内因则是西汉王朝没有实力彻底消灭匈奴,具体表现在军事、经济的限制,不得不使用长城防御;且“内外有别”的文化影响对匈奴的认识,这便加深了对匈奴威胁的心理负担,所以在现实和心理的双重压力下,借鉴历史经验,修筑长城。 The production of anything is the result of both internal and external causes, the Great Wall of the Western Han Dynasty is no exception. The external cause of the Great Wall of the Western Han Dynasty was built by the Huns and the internal cause was that the Western Han Dynasty did not have the strength to eliminate the Huns completely. It manifested itself in military and economic constraints and had to use the Great Wall defense. Moreover, the culture influence of the Huns This deepens the psychological burden of threats to the Huns. Therefore, under the dual pressures of reality and psychology, it draws on historical experience and builds the Great Wall.