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          China Daily |
          Updated: 2021-11-20 08:07
        
        
          
          
          
          
        

      
    


      
    
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   Due to the complex construction area, it is necessary to use helicopters to transport living and working materials to the mountains; every time a well is drilled, workers have to transport the drilling equipment by pulling and shouldering; different collection methods and equipment are employed in different areas; high mountains bring unprecedented challenges, and it is also called a restricted area by local residents. [Photo by Jin Tian/For China Daily] 
 
     

     

        
      
    
      
      
      
    
        
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