Cutting-edge green tech on display in Beijing

        

      

      

        
          
          chinadaily.com.cn |
          Updated: 2021-07-14 14:25
          
          
          
          
        


        
      

      

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   Visitors observe a sludge drying and treatment system at the 19th China International Environmental Protection Exhibition in Beijing on July 13, 2021. [Photo/IC] 
 
 

 

        


        
        
      

        
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