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          Epidemic-prevention materials trade fair kicks off in Shanghai
          
        
          
      
          
      
          
        
          
          chinadaily.com.cn |
          Updated: 2020-07-22 17:18
          
          
          
          
        


        
      
          
      
          
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   An exhibitor demonstrates an ultrasonic spray device to visitors on July 22, 2020, in the Shanghai World Trade Center Exhibition Hall. The device can disinfect the environment by spraying sterilizing water. [Photo/Gao Erqiang for China Daily] 
 
           

           

          
        
          

        
        
      
          
        
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