长城东起鸭绿江,西抵嘉峪关,横贯我国北部万里群山,把成千上万雄关隘口、望台和烽火台连成一气。最宽处近10米,构成泱泱五千年东方文明古国建筑史上的一大奇观,成了中华民族威武不屈、团结奋进的象征。前些年,国外宇航界介绍说:“从太空看地球,长城是用肉眼惟一能看见的建筑物 The Great Wall stretches from the Yalu River in the east to Jiayuguan in the west and runs through thousands of miles of mountains in the northern part of the country. It connects thousands of majestic Guankou, Wangtai, and Beacon Terraces. At the widest point of nearly 10 meters, it constitutes a major spectacle in the history of the 5,000-year-old Eastern civilization, and it has become a symbol of the Chinese nation’s mighty, unyielding, and united and forging ahead. In previous years, the foreign space community introduced: “Looking at the Earth from space, the Great Wall is the only building visible to the naked eye.