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Short term investments (Details) | Jun. 30, 2025 USD ($) | Jun. 30, 2025 CNY (¥) | Dec. 31, 2024 CNY (¥)
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Short-term Investments |  |  |
Marketable securities | $ 66,060,012 | ¥ 472,897,200 | ¥ 149,583,000

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