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INVENTORIES - Amount of inventories recognized as an expense and included in profit or loss (Details) - CNY (¥)
¥ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
INVENTORIES    
Carrying amount of inventories sold ¥ 16,625 ¥ 43,108
Write down of inventories (included in cost of sales) 0  
Costs Of Sales ¥ 16,625 ¥ 43,108