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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Parenthetical) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥)
Other comprehensive income/(loss), tax |  | ¥ 0 | ¥ 0
Foreign currency translation difference, tax |  | 0 | 0
Research and development expenses |  |  |
Services rendered from related party | $ 125,440 | 873,288 | 223,732
Online marketplace services |  |  |
Services rendered from related party | $ 204,658 | ¥ 1,424,786 | ¥ 1,042,630

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