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Share-based compensation (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based compensation |  |  |
Share-based compensation expenses | ¥ 3,694,955 | ¥ 3,659,989 | ¥ 2,780,062
Cost of revenues |  |  |
Share-based compensation |  |  |
Share-based compensation expenses | 82,243 | 71,983 | 27,513
Fulfillment |  |  |
Share-based compensation |  |  |
Share-based compensation expenses | 440,167 | 418,895 | 425,706
Marketing |  |  |
Share-based compensation |  |  |
Share-based compensation expenses | 258,860 | 190,499 | 135,749
Research and development |  |  |
Share-based compensation |  |  |
Share-based compensation expenses | 1,340,317 | 1,162,579 | 670,612
General and administrative |  |  |
Share-based compensation |  |  |
Share-based compensation expenses | ¥ 1,573,368 | ¥ 1,816,033 | ¥ 1,520,482

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