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TRADE RECEIVABLES (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2022 USD ($) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 CNY (¥)
--- | --- | --- | ---
Non-current |  |  |
Trade receivables from construction contracts | $ 1,904 | ¥ 13,128 | ¥ 17,033
Less: Impairment allowance | (379) | (2,608) | (7,532)
Total of Non-current trade receivables | 1,525 | 10,520 | 9,501
Current |  |  |
Trade receivables from service concession agreement | 3,324 | 22,927 | 11,252
Trade receivables from construction contracts | 5,052 | 34,850 | 40,356
Less: Impairment allowance | (1,597) | (11,017) | (10,082)
Total of current trade receivables | 6,779 | 46,760 | 41,526
Total | $ 8,304 | ¥ 57,280 | ¥ 51,027

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