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Cost of delivery services income and other revenues (Tables) | 12 Months Ended
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Dec. 31, 2024
Cost of delivery services income and other revenues |
Schedule of cost of delivery services income and other revenues | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the years ended December 31,
​ | ​ | 2022 | ​ | 2023 | ​ | 2024
​ |  | RMB |  | RMB |  | RMB |  | US$
Delivery cost |  | — |  | 131,685,885 |  | 200,004,561 |  | 27,400,512
Other costs* |  | 56,202,270 |  | 711,777 |  | — |  | —
​ |  | 56,202,270 |  | 132,397,662 |  | 200,004,561 |  | 27,400,512
* Other costs include commission expenses, salaries and cost of educational services.

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