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Short-term investments (Details Narrative) | 6 Months Ended |  |
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Jun. 30, 2025 USD ($) | Jun. 30, 2025 CNY (¥) | Jun. 30, 2025 CNY (¥) | Dec. 31, 2024 CNY (¥)
Short-term Investments |  |  |  |
Short term investments | $ 66,060,012 |  | ¥ 472,897,200 | ¥ 149,583,000
Invested in marketable securities | 54,400,000 | ¥ 389,427,840 |  |
Profit on marketable securities | $ 173,112 | ¥ 1,239,240 |  |

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