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Guangzhou, south China's Guangdong Province
A passenger scans a QR code of mobile payment at the exit of the Huadu Moter City Subway Station in Guangzhou, capital of south China's Guangdong Province, Dec. 28, 2017. Four new subway lines opened in Guangzhou on Thursday. Guangzhou now has 13 subway lines in all, covering a total length of 390.6 km. (Xinhua/Wu Lu)
