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Short-term investments (Details)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Debt securities:      
Wealth management products issued by banks or security/trust companies ¥ 178,821,757 $ 24,498,480 ¥ 350,164,305
Equity securities:      
Marketable equity securities 939,725,698 128,741,893 292,729,235
Short-term investments ¥ 1,118,547,455 $ 153,240,373 ¥ 642,893,540