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Other current liabilities (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥)
--- | --- | --- | ---
Other current liabilities |  |  |
Professional service fee |  | ¥ 9,245 | ¥ 5,741
Online promotional expense payables |  | 19,761 | 28,595
Tickets printing and delivery payables |  | 1,049 | 1,271
Advertising expense payables |  | 7,816 | 1,798
Others |  | 3,693 | 3,508
Total | $ 6,370 | ¥ 41,564 | ¥ 40,913

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