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China's extra-large tunneling machine ready for work in Shenzhen 

          

          
 Source: Xinhua| 2019-07-22 21:50:22|Editor:  Yurou 

          

                
          

          

          

          

          

          
    

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          Amazing time-lapse video: A China-designed extra-large tunnel boring machine is lowered into a shaft in Shenzhen.
           

          

          

          
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