Youth robot festival held in C China's Hunan
    
        
    
      
    
      
    
        
          
          Xinhua |
          Updated: 2018-05-06 16:10
          
          
          
          
        


        
      
    
      
    
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   Children experience 3D printing pens during a youth robot festival in Longhui county, Central China's Hunan province, May 5, 2018. [Photo/Xinhua] 
 
     

     

        
    

        
        
      
    
        
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