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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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