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          World heritage expert goes to ice cave
          
      
          
      
          
        
          By Sun Ruisheng | 
          chinadaily.com.cn |
          Updated: 2017-04-27 17:16
        
        
          
          
          
          
        

      
          


      
          
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          An ice cave stays below freezing despite the arrival of spring in Ningwu county, North China's Shanxi province. The ice cave was formed about 3 million years ago and its temperature stays at -6 Celsius degrees throughout the year. [Photo by Wang Quan / chinadaily.com.cn]
          		 
  
           
            

           

           
           

           
           

        
      
          
      
      
      
          
        
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