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Accounts Receivables (Details)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Accounts Receivables        
Accounts receivables ¥ 34,550,465 $ 4,733,394 ¥ 26,082,307  
Allowance for credit losses (274,956) (37,669) (205,489) $ (28,152)
Accounts receivables, net ¥ 34,275,509 $ 4,695,725 ¥ 25,876,818