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Prepayments and other current assets (Details)
¥ in Thousands
Dec. 31, 2021
USD ($)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CNY (¥)
Deposits paid $ 243,000   $ 838,000  
Prepayments 104,000   168,000  
Other receivables 222,000   250,000  
Other tax recoverable 3,000   258,000  
Prepayments and other current assets 572,000   1,514,000  
ZHEJIANG TIANLAN        
Prepayments | ¥   ¥ 22,717   ¥ 16,632
Prepayments and other current assets | ¥   33,498   28,387
Deposits paid for bidding projects and temporary payments | ¥   7,030   10,448
Other current assets | ¥   ¥ 3,751   ¥ 1,307
ZHEJIANG TIANLAN        
Other receivables $ 13,988,000   $ 10,448,000