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Property and Equipment, Net (Tables)
12 Months Ended
Dec. 31, 2022
Property, Plant and Equipment [Abstract]  
Schedule of property and equipment, net
   As of 
   December 31,
   December 31,
 
   2021   2022 
   RMB   RMB   US$ 
Motor vehicles   1,428,587    1,538,213    220,862 
Electronic equipment   1,255,203    1,783,988    256,151 
Machinery   117,656    1,119,594    160,755 
Other equipment   639,424    1,041,034    149,473 
Subtotal   3,440,870    5,482,829    787,241 
Less: accumulated depreciation   (2,286,895)   (2,869,565)   (412,020)
Property and equipment, net   1,153,975    2,613,264    375,221