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Children view train models at a train exhibition in Dallas, Texas, the United States, Dec. 19, 2019. "The Trains at NorthPark" exhibition in Dallas has become one of the premier holiday traditions. (Xinhua/Dan Tian)
Children view train models at a train exhibition in Dallas, Texas, the United States, Dec. 19, 2019. "The Trains at NorthPark" exhibition in Dallas has become one of the premier holiday traditions. (Xinhua/Dan Tian)