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A child tries the plasma magic ball at Yangzhou Science & Technology Museum in Yangzhou, east China's Jiangsu Province, May 3, 2019. People learn knowledge in various museums during the Labor Day holiday. (Xinhua/Meng Delong)
A child tries the plasma magic ball at Yangzhou Science & Technology Museum in Yangzhou, east China's Jiangsu Province, May 3, 2019. People learn knowledge in various museums during the Labor Day holiday. (Xinhua/Meng Delong)