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          Over 500 exhibitors display latest advances in urban rail technology
          
        
          
      
          
      
          
        
          
          chinadaily.com.cn |
          Updated: 2024-06-14 14:59
          
          
          
          
        


        
      
          
      
          
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   A staff member introduces a "3D intelligent visual pass-checking machine" at an exhibition in Nanjing, East China's Jiangsu province, on June 13, 2024. [Photo/Xinhua] 
 
           

           

          
        
          

        
        
      
          
        
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