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REVENUE INFORMATION - Revenues based on geographic areas (Details)
12 Months Ended
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
REVENUE INFORMATION        
Revenues ¥ 2,651,757,646 $ 373,492,253 ¥ 3,168,597,334 ¥ 3,704,537,419
PRC        
REVENUE INFORMATION        
Revenues 2,247,593,239   2,583,843,616 3,158,966,932
Europe        
REVENUE INFORMATION        
Revenues 151,521,237   343,157,877 430,201,301
Others        
REVENUE INFORMATION        
Revenues ¥ 252,643,170   ¥ 241,595,841 ¥ 115,369,186