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FAIR VALUE MEASUREMENT (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2020
Dec. 31, 2019
FAIR VALUE MEASUREMENT    
Convertible bonds payable fair value ¥ 3,683,816 ¥ 2,448,646
Fair Value, Measurements, Recurring    
FAIR VALUE MEASUREMENT    
Liability measured at fair value   ¥ 10,759