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


        
      
          
      
          
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   A staff member prepares lunch for students at No 11 Primary School of Tongren City in Southwest China's Guizhou province, May 21, 2019. [Photo/Xinhua] 
 
           

           

           
          
          
        
          

        
        
      
          
        
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