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Accounts Receivable (Tables)
 6 Months Ended
Jun. 30, 2023
Accounts Receivable, Net [Abstract]  
Schedule of Accounts Receivable Accounts receivable and the expected credit losses consisted of the following:
   December 31   June 30 
   2022   2023 
   RMB   RMB   US$ 
Accounts receivable   1,617    684    94 
Less: expected credit losses   
-
    (29)   (4)
    1,617    655    90