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GOODWILL (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2024
GOODWILL. |
Schedule of goodwill | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the years ended December 31,
​ | ​ | 2023 | ​ | 2024
​ |  | RMB |  | RMB |  | US$
Balance as of January 1 | ​ | 575,427 | ​ | 575,427 | ​ | 78,833
Addition | ​ | — | ​ | — | ​ | —
Disposal | ​ | — | ​ | (3,211) | ​ | (440)
Impairment | ​ | — | ​ | — | ​ | —
Balance as of December 31 | ​ | 575,427 | ​ | 572,216 | ​ | 78,393

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