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Students of the Branch of No. 5 Middle School and Guozijian Middle School do experiments at a scientific event in Beijing, capital of China, Nov. 13, 2017. (Xinhua/Zhou Liang)
Students of the Branch of No. 5 Middle School and Guozijian Middle School do experiments at a scientific event in Beijing, capital of China, Nov. 13, 2017. (Xinhua/Zhou Liang)