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


        
      
          
      
          
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   File photo shows the pottery bowl excavated in the Pingliangtai Ancient City ruins in Huaiyang, Central China's Henan province. [Photo/Xinhua] 
 
           

          
          
        
          

        
        
      
          
        
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