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Principal Accounting Policies (Details 4) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Principal Accounting Policies      
Balance at the beginning of the year ¥ 113,253 ¥ 77,147 ¥ 130,648
Provisions 265,930 40,600 (30,946)
Write-offs (9,201) (4,494) (22,555)
Balance at the end of the year ¥ 369,982 ¥ 113,253 ¥ 77,147