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Other operating income (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Other operating income.        
Government grants   ¥ 427,832 ¥ 553,153 ¥ 347,817
Claims income   96,388 101,778 68,993
Others   121,193 102,131 114,245
Total other operating income $ 92,708 ¥ 645,413 ¥ 757,062 ¥ 531,055