Big-data based monitoring system helps guarantee food safety for students
    
        
    
      
    
      
    
        
          
          Xinhua |
          Updated: 2019-05-22 09:22
          
          
          
          
        


        
      
    
      
    
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   Students queue up for lunch at No 11 Primary School of Tongren city in Southwest China's Guizhou province, May 21, 2019. [Photo/Xinhua] 
 
     

     

        
    

        
        
      
    
        
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