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LOANS AND BORROWINGS - Type of short-term borrowings (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Short-term borrowings by type    
Unsecured short-term loans and borrowings ¥ 221,436 ¥ 80,000
Secured short-term loans and borrowings 1,009,320 317,213
Short-term borrowings ¥ 1,230,756 ¥ 397,213