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GOODWILL (Tables)
12 Months Ended
Dec. 31, 2025
GOODWILL.  
Schedule of goodwill

For the years ended December 31,

2024

2025

  ​ ​ ​

RMB

  ​ ​ ​

RMB

  ​ ​ ​

US$

Balance as of January 1

575,427

572,216

81,826

Addition

Disposal

(3,211)

Impairment

Balance as of December 31

572,216

572,216

81,826