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Long-term investments (Details Narrative)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 CNY (¥)	Dec. 31, 2023 CNY (¥)
Schedule of Investments [Line Items]
Cost method investments	$ 13,503	¥ 97,062	¥ 97,062
Investment 1 [Member]
Schedule of Investments [Line Items]
Impairment allowance	74,291	534,031
Investment 2 [Member]
Schedule of Investments [Line Items]
Impairment allowance	$ 79,142	¥ 568,907

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Sum of the carrying amounts as of the balance sheet date of all investments.

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-Section S99
-Paragraph 19
-Subparagraph (3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-19

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