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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