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Train attendant supervisor Xu Ying works on a Beijing-Tianjin high-speed intercity train at Beijing South Railway Station in Beijing, capital of China, July 10, 2018. (Xinhua/Li Ran)

Train attendant supervisor Xu Ying works on a Beijing-Tianjin high-speed intercity train at Beijing South Railway Station in Beijing, capital of China, July 10, 2018. (Xinhua/Li Ran)