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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