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Depreciation, amortization, shipping and handling expenses - Summary of Other Operating Income (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥)
Disclosure Of Information On Income Statement [line items] |  |  |  |
Interest income | ¥ 132,083 | $ 20,892 | ¥ 166,970 | ¥ 177,261
Dividend income from quoted equity securities | 168 | 26 | 166 | 959
Gain on disposal of property, plant and equipment | 1,224 | 194 |  |
Gain on disposal of quoted equity securities | 5,416 | 857 | 874 | 11,528
Gain on disposal of right-of-use assets | 14,714 | 2,327 | 2,574 | 9,237
Government grants | 152,932 | 24,190 | 209,793 | 122,371
Fair value gain on quoted equity securities | 138 | 22 |  | 1,118
Fair value gain on foreign exchange forward contract | 0 | 0 | 999 |
Realised foreign exchange gain, net | 0 | 0 | 1,390 | 3,604
Unrealised foreign exchange gain, net | 0 | 0 | 1,827 | 4,679
Others | 19,496 | 3,083 | 15,676 | 16,404
Other operating income | ¥ 326,171 | $ 51,591 | ¥ 400,269 | ¥ 347,161

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