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Children learn the airflow knowledge at Hefei Science and Technology Museum in Hefei, capital of east China's Anhui Province, Oct. 2, 2017, during the eight-day National Day and Mid-Autumn Festival holiday. (Xinhua/Liu Junxi)
Children learn the airflow knowledge at Hefei Science and Technology Museum in Hefei, capital of east China's Anhui Province, Oct. 2, 2017, during the eight-day National Day and Mid-Autumn Festival holiday. (Xinhua/Liu Junxi)