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A visitor is seen at the snow-covered Palace Museum in Beijing, capital of China, Feb. 14, 2019. All tickets to the museum, which allows 80,000 visitors per day, were sold out on Thursday. (Xinhua/Jin Liangkuai)

A visitor is seen at the snow-covered Palace Museum in Beijing, capital of China, Feb. 14, 2019. All tickets to the museum, which allows 80,000 visitors per day, were sold out on Thursday. (Xinhua/Jin Liangkuai)