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Accounts receivable, net (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥)
--- | --- | --- | --- | --- | ---
Accounts receivable, net |  |  |  |  |
Accounts receivable, gross |  | ¥ 2,332,236 | ¥ 1,439,013 |  |
Less: allowance for doubtful accounts |  | (142,256) | (86,417) | ¥ (46,900) | ¥ (43,084)
Accounts Receivable, after Allowance for Credit Loss, Current, Total | $ 314,571 | 2,189,980 | 1,352,596 |  |
Short-term bank borrowings | $ 70,384 | 490,000 | 395,000 |  |
Bank of China in Shenzhen |  |  |  |  |
Accounts receivable, net |  |  |  |  |
Short-term bank borrowings |  |  | 50,000 |  |
Various Banks In China |  |  |  |  |
Accounts receivable, net |  |  |  |  |
Short-term bank borrowings |  | 185,000 |  |  |
Real estate developers |  |  |  |  |
Accounts receivable, net |  |  |  |  |
Accounts receivable, gross |  | 2,329,431 | 1,436,367 |  |
Real estate developers | Collateral Pledged |  |  |  |  |
Accounts receivable, net |  |  |  |  |
Accounts receivable, gross |  | 263,550 | 65,697 |  |
individual customers |  |  |  |  |
Accounts receivable, net |  |  |  |  |
Accounts receivable, gross |  | ¥ 2,805 | ¥ 2,646 |  |

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