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LEASES - Maturities of lease liabilities (Details) - Dec. 31, 2019
USD ($)
CNY (¥)
Schedule, by years, of maturities of lease liabilities    
2020 $ 92,710 ¥ 646,000
Total lease payments 92,710 646,000
Less: imputed interest (791) (5,509)
Present value of lease liabilities $ 91,919 ¥ 640,491