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Short-term borrowings (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥)
--- | --- | --- | ---
Short-term borrowings |  |  |
Short-term borrowings | $ 30,739 | ¥ 200,000 | ¥ 1,878,286
Short-term borrowings |  |  |
Short-term borrowings |  |  |
Weighted average interest rate | 7.00% | 7.00% | 5.45%

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