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Long-term investments (Details Narrative)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
Schedule of Investments [Line Items]      
Cost method investments $ 13,503 ¥ 97,062 ¥ 97,062
Investment 1 [Member]      
Schedule of Investments [Line Items]      
Impairment allowance 74,291 534,031  
Investment 2 [Member]      
Schedule of Investments [Line Items]      
Impairment allowance $ 79,142 ¥ 568,907