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LEASES (Details) - CNY (¥)
¥ in Thousands
Jun. 30, 2021
Dec. 31, 2020
LEASES    
Right-of-use assets ¥ 51,326 ¥ 58,458
Lease liabilities 46,212 60,159
Lease liabilities - current 15,423 13,431
Lease liabilities ? noncurrent ¥ 30,789 ¥ 46,728