Formula of happiness

        

      

      

        
          By Wang Kaihao | 
          China Daily |
          Updated: 2022-11-01 07:57
          
          
          
          
        


        
      

      

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   Xu Dan (center) and colleagues ushered in hi-tech facilities to create a new form of agriculture in suburban Beijing. [Photo provided to China Daily] 
 
 

 

 
 

 

        


        
        
      

        
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