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          A monumental undertaking
          
        
          
      
          
      
          
        
          
          CHINA DAILY |
          Updated: 2023-12-23 09:22
          
          
          
          
        


        
      
          
      
          
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   Li Zhe, a researcher from the School of Architecture at Tianjin University, accompanied by a student, conducts a field survey of the Great Wall in outer Beijing on an all-terrain vehicle. ZHAO ZISHUO/LI RAN/SUN FANYUE/XINHUA 
 
           

           

          The Great Wall of China, as one of the wonders of the world, was built over the course of 2,000 years, with construction continuing from the Spring and Autumn Period (770-476 BC) to the Ming Dynasty (1368-1644). The existing sections have a total length of more than 21,196 kilometers.
           

          
        
          

        
        
      
          
        
          
          
        

        
          
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