原创《明代长城近三成消失》：本文关于长城论文范文,可以做为相关论文参考文献,与写作提纲思路参考。
Leading：
长城在1987年被列入《世界遗产名录》,然而没过多久,世界古迹基金会就把它列为100个最濒危的历史文化遗产之一.目前长城的基本情况是三分之一完好,三分之一残破不全,三分之一不复存在.
Around 30% of China’s Ming-era Great Wall has disappeared over time as adverse① natural conditions and reckless human activities—including stealing bricks to build houses—erode the UNESCO world heritage site,state media has reported. The Great Wall is not a single unbroken structure but stretches for thousands of miles in sections,from Shanhaiguan on the east coast to Jiayuguan in the windswept sands on the edge of the Gobi desert to the west.
It is so destroyed in places that estimates of its total length vary from 9,000 to 21,000 kilometers,depending on whether missing sections are included. Despite its length,it is not,as is sometimes claimed,visible from space.
Construction first began in the 3rd century BC,but nearly 6,300km were built in the Ming dynasty of 1368-1644,including the much-visited sections north of Beijing.
Of that,1,962km has melted away over the centuries,the Beijing Times reported. Some of the construction has weathered away,while plants growing in the walls he accelerated the decay②,said the report,citing a survey last year by the Great Wall of China Society.
“Even though some of the walls are built of bricks and stones,they cannot withstand the perennial③ exposure to wind and rain,”the paper quoted Dong Yaohui,a vice-president of the society,as saying.“Many towers are becoming increasingly shaky and may collapse in a single rain storm in summer.”
Touri and local residents’activities are also damaging the longest human construction in the world,the paper added. Poor villagers in Lulong county,in the northern province of Hebei, used to knock thick grey bricks from a section of wall in their village to build homes,and slabs④ engred with Chinese characters were sold for 30 yuan （￡3） each by locals,it said. Under Chinese regulations,people who take bricks from the Great Wall can be fined up to 5,000 yuan, according to the state-run Global Times.
“But there is no specific organization to enforce the rules,”said Jia Hailin,a cultural relics⑤ protection official in Hebei. “Damage could only be reported to higher authorities and it is hard to solve when it happened on the border of two provinces.”Explorations of undeveloped parts of the Great Wall—an increasingly popular leisure activity in recent years—had brought those sections more tourists than they could bear,damaging them severely,the Global Times report added.
长城论文参考资料：
结论：明代长城近三成消失为关于对写作长城论文范文与课题研究的大学硕士、相关本科毕业论文长城论文开题报告范文和相关文献综述及职称论文参考文献资料下载有帮助。
