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Property and equipment, net (Details)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Property and equipment, net      
Property and equipment, gross ¥ 1,641,782,323 $ 224,923,256 ¥ 1,344,759,262
Less accumulated depreciation 54,915,306 7,523,366 35,527,263
Less impairment 833,390 114,174 894,274
Property and equipment, net 1,586,033,627 217,285,716 1,308,337,725
Construction in progress      
Property and equipment, net      
Property and equipment, gross 1,302,148,272 178,393,582 1,134,688,427
Leasehold improvements      
Property and equipment, net      
Property and equipment, gross 15,967,920 2,187,596 13,615,929
Office and electronic equipment      
Property and equipment, net      
Property and equipment, gross 11,704,829 1,603,555 7,774,324
Motor vehicles      
Property and equipment, net      
Property and equipment, gross 13,402,055 1,836,074 13,313,052
Aircraft      
Property and equipment, net      
Property and equipment, gross 180,292,710 24,700,000 ¥ 175,367,530
Buildings      
Property and equipment, net      
Property and equipment, gross ¥ 118,266,537 $ 16,000,000