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Intangible assets, net (Details) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥)
--- | --- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |  |
Subtotal | $ 1,686,050 | ¥ 11,941,786 | ¥ 30,345,632
Less: accumulated amortization | (1,141,830) | (8,087,239) | (14,969,108)
Less: intangible assets impairment loss | (544,220) | (3,854,547) |
Total |  |  | 15,376,524
Customer Relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Subtotal | 183,546 | 1,300,000 | 13,300,000
Software [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Subtotal | 1,446,028 | 10,241,786 | 14,745,632
Noncompete Agreements [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Subtotal | $ 56,476 | ¥ 400,000 | ¥ 2,300,000

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