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萬里長城是我國古代的一項極為重要的軍事工程,它東起河北的山海關,橫跨山西、內蒙、陜西、寧夏、西迄甘肅嘉峪關,全長一萬二千多華里。遠在戰(zhàn)國時代(公元前475—221年)萬里長城就開始修建。當時主要是為了防御北方諸侯國和游牧民的滋擾而建的防衛(wèi)性城墻。秦(公元前221—207年)續(xù)建,形成了西起臨洮,東至遼東的萬里長城,現(xiàn)存長城是秦漢之后,經(jīng)北魏、北圍、北齊的隋、宋、元各
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The history is the aged with best memory. The 50-year-long China Railway Shisiju Group Corporation No. 2 Company with glorious histories has built Beijing-Jiulong Railway, Qinghai-Tibet Railway, Beijing-Shanghai Expressway and other key projects in the vast land of China. The Company has obtained one and another award of national and provincial excellent projects, created one and another perfect records and staged one and another splendid stories. Si Ma Tai Tunnel, the “No. 1 Tunnel of the Great Wall”, witnesses the excellent performance of this “Railway Army” once again.