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      China-Laos railway's longest tunnel holed through
      

      
Source: Xinhua|
Published: 2019-12-28

      

      
      
             
      
        
      
        
      
          
        
      
      
      
      
      
      

      
      
      
      
                        
      The longest tunnel of the China-Laos railway has been holed through.
      
 
            
      
      

      

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