Pillar rock in midstream
    
        
    
      
    
      
    
        
          
          chinadaily.com.cn |
          Updated: 2023-11-01 19:06
          
          
          
          
        


        
      
    
      
    
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   The world's largest main bearing in diameter for tunnel boring machines is assembled by China Railway Construction Heavy Industry Corp in Changsha, Hunan province, in October. [Photo provided to China Daily] 
 
     

     

          
        
    

        
        
      
    
        
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