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 shows newly-picked vegetables in Tongren, Southwest China's Guizhou province, May 21, 2019. [Photo/Xinhua] 
 
 

 

        


        
        
      

        
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