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COMMITMENTS AND CONTINGENCY - Purchase commitment (Details) - Jun. 30, 2022 - Purchase Commitment
CNY (¥)
USD ($)
Other Commitment, Fiscal Year Maturity [Abstract]    
2023 ¥ 26,967,803 $ 4,026,414
2024 300,000 44,791
2025 300,000 44,791
2026 150,000 22,396
Thereafter 0 0
Total minimum payments required ¥ 27,717,803 $ 4,138,392