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COMMITMENTS AND CONTINGENCY - Purchase commitment (Details) - Dec. 31, 2023 - Purchase Commitment
CNY (¥)
USD ($)
Purchase commitment    
2024 ¥ 23,357,995 $ 3,289,905
2025 300,000 42,254
Total minimum payments required ¥ 23,657,995 $ 3,332,159