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LOSS PER SHARE (Details) - ¥ / shares
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
LOSS PER SHARE    
Loss attributable to holders of ordinary shares (70,769,000) (111,508,000)
Weighted average number of ordinary shares outstanding used in computing basic and diluted earnings per share 4,357,598 2,731,374
Loss per share - basic (RMB) ¥ (16.24) ¥ (40.82)
Loss per share - diluted (RMB) ¥ (16.24) ¥ (40.82)