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LAND USE RIGHTS - Estimated future amortization expenses (Details) - Dec. 31, 2019 - Use Rights [Member]
USD ($)
CNY (¥)
Finite-Lived Intangible Assets [Line Items]    
2020 $ 3,909 ¥ 27,239
2021 3,909 27,239
2022 3,909 27,239
2023 3,909 27,239
2024 3,909 27,239
Thereafter 166,199 1,158,072
Total $ 185,744 ¥ 1,294,267