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COMMITMENTS AND CONTINGENCY - Purchase commitment (Details) - Jun. 30, 2021 - Purchase Commitment [Member]
CNY (¥)
USD ($)
Other Commitment, Fiscal Year Maturity [Abstract]    
2022 ¥ 15,337,798 $ 2,411,066
2023 300,000 47,159
2024 300,000 47,159
2025 300,000 47,159
Thereafter 0 0
Total minimum payments required ¥ 16,237,798 $ 2,552,543