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          Guardian of Dunhuang murals shares secrets of heritage protection
          
      
          
      
          
        
          
          chinadaily.com.cn |
          Updated: 2018-12-27 17:30
        
        
          
          
          
          
        

      
          


      
          
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   They also need to monitor the real-time concentration of suspended particulate matter in the air and collect samples of air microorganisms. [Photo/chinadaily.com.cn] 
 
           

           

        
      
          
      
      
      
          
        
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