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v3.25.1

Long-term investments (Details) | Dec. 31, 2024 USD ($) | Dec. 31, 2024 CNY (¥) | Dec. 31, 2023 CNY (¥)
--- | --- | --- | ---
Schedule of Investments [Line Items] |  |  |
Subtotal | $ 166,936 | ¥ 1,200,000 | ¥ 1,200,000
Less: Impairment loss | 153,433 | 1,102,938 | 1,102,938
Total | 13,503 | 97,062 | 97,062
Investment 1 [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Subtotal | 83,468 | 600,000 | 600,000
Investment 2 [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Subtotal | $ 83,468 | ¥ 600,000 | ¥ 600,000

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