【六合第今期公司_今期买马开奖结果】Children greet 2018 National Science Day across China

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Children accompanied by their parents learn about optics knowledge at Science and Technology Museum in Binzhou, east China's Shandong Province, Sept. 15, 2018. Various activities are scheduled to be held from Sept. 15 to Sept. 21 across China to greet the 2018 National Science Day held each year. (Xinhua/Chen Bin)

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