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LOANS AND BORROWINGS - Long-term borrowings (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Long-term borrowings by type    
Unsecured long-term loans and borrowings ¥ 60,000 ¥ 112,500
Secured long-term loans and borrowings 19,532,853 11,376,880
Long-term borrowings ¥ 19,592,853 ¥ 11,489,380