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E-mail Xinhua, February 28, 2023A technician uses a flaw detector to detect rail track near the Duyun East Railway Station along Guiyang-Nanning high-speed railway in Duyun, southwest China's Guizhou Province, Feb. 27, 2023. The Guiyang-Nanning high-speed railway, with a maximum speed of 350 km per hour, is expected to go into service in 2023. (Xinhua/Liu Xu)

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