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Short-term investments (Tables)
12 Months Ended
Dec. 31, 2024
Short-term investments  
Schedule of short-term Investments

As of December 31,

    

2023

    

2024

RMB

RMB

    

US$

Debt securities:

 

  

Wealth management products issued by banks or security/trust companies

 

350,164,305

 

178,821,757

 

24,498,480

Equity securities:

 

 

 

Marketable equity securities

 

292,729,235

 

939,725,698

 

128,741,893

Short-term investments

 

642,893,540

 

1,118,547,455

 

153,240,373