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Property and equipment, net (Details)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 CNY (¥)	Dec. 31, 2023 CNY (¥)
Property, Plant and Equipment [Line Items]
Sub total	$ 190,475	¥ 1,369,212	¥ 1,649,663
Less: accumulated depreciation	(128,518)	(923,842)	(899,711)
Total	61,957	445,370	749,952
Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Sub total	2,845	20,448	37,520
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Sub total	20,493	147,312	139,119
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Sub total	167,137	1,201,452	1,201,452
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Sub total			¥ 271,572

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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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