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Bank Loans
12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
Bank Loans
13.
BANK LOANS
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
As at December 31
 
    
2020
    
2021
    
2021
 
    
RMB
    
RMB
    
US$
 
Short-term bank loans
     278,488        1,348,166        211,557  
Long-term third-party bank loan guaranteed by a related party (Note 20):
                          
Current portion
     74,351        —          —    
    
 
 
    
 
 
    
 
 
 
       352,839        1,348,166        211,557  
    
 
 
    
 
 
    
 
 
 
The weighted average interest rate for the outstanding short-term bank loans as of December 31, 2020 and 2021 was 4.28% and
 4.59
%, respectively. 
There are no commitment fees and conditions under which lines may be withdrawn associated with the Group’s unused facilities.