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v3.25.1

Segments (Details 1) | 12 Months Ended
--- | ---
Dec. 31, 2024 USD ($) | Dec. 31, 2024 CNY (¥) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥)
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Total revenues | $ 75,327,948 | ¥ 541,487,420 | ¥ 580,016,414 | ¥ 586,060,092
Mainland PRC [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Total revenues | 57,699,003 | 414,763,523 | 540,294,309 | 448,978,186
HONG KONG |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Total revenues | 17,628,945 | 126,723,897 | 29,612,277 |
International [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Total revenues |  |  | ¥ 10,109,828 | ¥ 137,081,907

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