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The crew of Guangzhou-Shenzhen-Hong Kong high-speed railway pose for photos at Shenzhen North Railway Station in Shenzhen, south China's Guangdong Province, Sept, 23, 2018. (Xinhua/Mao Siqian)

The crew of Guangzhou-Shenzhen-Hong Kong high-speed railway pose for photos at Shenzhen North Railway Station in Shenzhen, south China's Guangdong Province, Sept, 23, 2018. (Xinhua/Mao Siqian)