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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) -Schedule of accumulated other comprehensive income (loss) (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2023 CNY (¥) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 CNY (¥)
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) |  |  |  |
Beginning Balance | ¥ 453,074 |  | ¥ (207,882) | ¥ (68,440)
Foreign currency translation adjustments, net of tax of nil | 102,268 |  | 660,956 | (139,442)
Ending Balance | ¥ 555,342 | $ 78,218 | ¥ 453,074 | ¥ (207,882)

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