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Wang Gang closes a door of the 7220190 refrigerator train at the Xili Railway Station in Shenzhen, south China's Guangdong Province, Jan. 19, 2019. (Xinhua/Ding Le)
Wang Gang closes a door of the 7220190 refrigerator train at the Xili Railway Station in Shenzhen, south China's Guangdong Province, Jan. 19, 2019. (Xinhua/Ding Le)