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TRADE RECEIVABLES (Details) - CNY (¥)
¥ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
TRADE RECEIVABLES      
Trade receivables   ¥ 754,386 ¥ 747,247
Less: provision for impairment ¥ (695,604) (645,777)  
Current trade receivables ¥ 58,782 ¥ 101,470