Archaeologists find China's earliest urban drainage system
    
        
    
      
    
      
    
        
          
          Xinhua |
          Updated: 2020-03-24 09:18
          
          
          
          
        


        
      
    
      
    
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   File photo shows a part of a jade crown excavated in the Pingliangtai Ancient City ruins in Huaiyang, Central China's Henan province. [Photo/Xinhua] 
 
     

     

          
        
    

        
        
      
    
        
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