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FINANCE INCOME AND COSTS (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
Finance Income And Costs        
   Interest income on loans to related parties/ a third party | ¥   ¥ 6,792 ¥ 6,780 ¥ 6,455
Interest income on loans to related parties/ a third party | $ $ 985      
Interest income on revenue contracts with significant financing component 305 2,104 2,313 3,161
Interest income from service concession arrangement 960 6,620 7,264 4,977
Interest income on structured deposits 328 660
Interest income on bank deposit 13 91 250 215
Finance income 2,263 15,607 16,935 15,468
Interest expenses on loans 563 3,882 4,035 4,028
Interest expense on lease liabilities 19 133 150 80
Other finance costs [1] (90) (620) 231 292
Less: interest expense capitalized into intangible assets-concession right [2] (57) (651)
Finance costs 492 3,395 4,359 3,749
Bank charges 6 42 38 37
Foreign currency exchange losses/(gains) $ (96) ¥ (662) ¥ 193 ¥ 255
Capitalized rate 5.05% 5.05% 5.05%  
[1] Finance costs from operations mainly represented bank charges and foreign currency exchange differences. The amounts of bank charges were CNY37, CNY38 and CNY42 (US$6) and the foreign currency exchange losses/(gains) amounted to CNY255, CNY193 and CNY (662) (US$(96)) for the years ended December 31, 2020, 2021 and 2022, respectively.
[2] The borrowing costs have been capitalized at a rate of 5.05% per annum during the years ended December 31, 2020 and 2021.