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Inventories, net (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2018 USD ($) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥)
--- | --- | --- | ---
Inventories |  |  |
Inventory, Gross |  | ¥ 44,898,944 | ¥ 42,199,152
Inventory valuation allowance |  | (868,860) | (498,773)
Inventories, net | $ 6,403,910 | 44,030,084 | 41,700,379
Products |  |  |
Inventories |  |  |
Inventory, Gross |  | 44,678,983 | 41,840,945
Packing materials and others |  |  |
Inventories |  |  |
Inventory, Gross |  | ¥ 219,961 | ¥ 358,207

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