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LEASES - Operating leases recognized in balance sheet (Details)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
LEASES      
Operating lease right-of-use assets ¥ 12,061,697 $ 1,748,782 ¥ 6,363,724
Current portion of operating lease liabilities 5,792,931 839,896 4,306,738
Non-current portion of operating lease liabilities ¥ 7,405,805 $ 1,073,741 ¥ 2,567,342