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2020/4/11,1,Corporate Culture,2020/4/11,3,Corporate Culture,The Great Wall of China is a series of stone and,earthen fortifications in northern China, built originally,to protect the northern borders of the Chinese Empire,against intrusions by various nomadic groups. Several,walls have been built since the 5th century BC that are,referred to collectively as the Great Wall, which has,been rebuilt and maintained from the 5th century BC,through the 16th century. One of the most famous is,the wall built between 220,206 BC by the first Emperor,of China, Qin Shi Huang. Little of that wall remains,the majority of the existing wall was built during the,Ming Dynasty,2020/4/11,4,Corporate Culture,The Great Wall stretches from Shanhaiguan in the,east, to Lop Nur in the west, along an arc that roughly,delineates the southern edge of Inner Mongolia. The,most comprehensive archaeological survey has,recently concluded that the entire Great Wall, with all,of its branches, stretches for 8,851.8,km. This is made,up of 6,259.6,km sections of actual wall, 359.7,km of,trenches and 2,232.5,km of natural defensive barriers,such as hills and rivers,2020/4/11,5,Corporate Culture,2020/4/11,6,Corporate Culture,2020/4/11,7,Corporate Culture,The Chinese were already familiar with the techniques,of wall-building by the time of the Spring and Autumn,Period. During the Warring States Period from the 5th,century BC to 221 BC, the states of Qin, Wei, Zhao, Qi,and Yan all constructed extensive fortifications to defend,their own borders. Qin Shi Huang conquered all opposing,states and unified China in 221 BC, establishing the Qin,Dynasty. To protect the empire against intrusions by the,Xiongnu people from the north, he ordered the building of,a new wall to connect the remaining fortifications along the,empires new northern frontier. Most of the ancient walls,have eroded away over the centuries, and very few,sections remain today,2020/4/11,8,Corporate Culture,Later, the Han, Sui and Jin dynasties all repaired,rebuilt, or expanded sections of the Great Wall at great,cost to defend themselves against northern invaders,Towards the end of the Ming Dynasty, the Great Wall,helped defend the empire against the Manchu invasions,However, when the gates at Shanhaiguan were opened by,Wu Sangui, the Manchus quickly seized Beijing and,established the Qing Dynasty. Under Qing rule, Chinas,borders extended beyond the walls and Mongolia was,annexed into the empire, so construction and repairs on,the Great Wall were discontinued,2020/4/11,9,Corporate Culture,从春秋时代开始，我国古代人民便已熟悉城墙建造技术,在从公元前,5,世纪至公元前,221,年的战国时期，秦、魏、赵,齐和燕各国建立广泛的防御工事来保卫自己的边界。公元,前,221,年，秦始皇征服了所有反对国家而统一了个国，建立,秦朝。为了避免匈奴人的入侵，他下沿着整个国家的北部,边界建立新的城墙，以连接残留的防御工事。古城墙大部,分已侵蚀了数百年，只有极少数路段保留至今。后来的长,城由汉，隋和晋朝以极大的代价来修理，改建或是扩建长,城以捍卫自己免于北方的侵略。在,15,世纪,40-60,年代，明朝,修建了所谓的“辽东长城”。明朝末年，长城抵御了满清,帝国入侵。然而，当山海关隘口被吴三桂打开后，满族人,迅速占领了北京，建立了清朝。在清朝统治下，中国的边,界一直延伸到长城之外和蒙古，所以建造和维修长城的工,事被停止,2020/4/11,10,Corporate Culture,1. North Pass of Juyongguan pass, known as the Badaling,Made of stone and bricks from the hills, this portion of the Great,Wall is 7.8,meters (25.6,ft) high and 5,meters (16.4,ft) wide,北通”居庸关，也就是八达岭。由石头和砖块砌成，这部分长城,高,7.8,米,25.6,英尺）宽,5,米,16.4,英尺,2. “West Pass” of Jiayuguan . This fort is near the western,edges of the Great Wall,西通”嘉峪关。这个要塞靠近长城的西部边缘,3. East Pass of Shanhaiguan. This fort is near the eastern,edges of the Great Wall,东通”山海关。这个要塞靠近长城的东部边缘,2020/4/11,11,Corporate Culture,2020/4/11,12,Corporate Culture,The Great Wall is the mightiest work of man, the only,one that would be visible to the human eye from the,moon.,Richard Halliburton,长城是人类最伟大的工程，是唯一可以从月球上直接用肉眼,看到的东西,理查,德,哈里伯顿,The Great Wall is a maximum 9.1 m (30 ft) wide, and is,about the same color as the soil surrounding it. Based,on the optics of resolving power, only an object of,reasonable contrast to its surroundings which is 70 mi,110 km) or more in diameter would be visible to the,unaided eye from the moon. The apparent width of the,Great Wall from the moon is the same as that of a human,hair viewed from 2 miles away. To see the wall from the,2020/4/11,13,Corporate Culture,A more controversial question is whether the Wall is visible,from low earth orbit (an altitude of as little as 100 miles (160,km). NASA claims that it is barely visible, and only under nearly,perfect conditions; it is no more conspicuous than many other,man-made objects,比较有争议的问题是，长城在低地球轨道上,海拔仅为,100,英里,160,公里）是否可见。美国国家航空航天局声称几乎是看不到的,只有在近乎完美的条件下才可以；它并不比其他许多人造的物体更,显著,2020/4/11,14,Corporate Culture,2020/4/11,15,Corporate Culture
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