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LOANS AND BORROWINGS - Total loans and borrowings (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Loans and borrowings    
Short-term borrowings ¥ 1,230,756 ¥ 397,213
Current portion of long-term borrowings 922,634 740,524
Sub-total 2,153,390 1,137,737
Long-term borrowings, excluding current portion 10,566,746 8,028,473
Total loans and borrowings ¥ 12,720,136 ¥ 9,166,210