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Short-term deposits and long-term deposits (Tables)
12 Months Ended
Dec. 31, 2025
Short-term deposits and long-term deposits  
Schedule for short-term deposits and long-term deposits

December 31, 2024

December 31, 2025

RMB

RMB

  ​ ​ ​

Amount

  ​ ​ ​

equivalent

  ​ ​ ​

Amount

  ​ ​ ​

equivalent

RMB

1,135,000

1,135,000

1,720,000

1,720,000

US$

 

408,999

2,940,048

200,000

1,405,760

Total

 

4,075,048

3,125,760

December 31, 2024

December 31, 2025

RMB

RMB

  ​ ​ ​

Amount

  ​ ​ ​

equivalent

  ​ ​ ​

Amount

  ​ ​ ​

equivalent

RMB

 

1,470,000

 

1,470,000

 

 

Total

 

  ​

 

1,470,000

 

  ​