Various activities held across China to greet annual day for science popularization
Source: Xinhua| 2018-09-15 21:02:44|Editor: mmm
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Children experience acoustics devices during a science popularization activity in Langfang, north China's Hebei Province, Sept. 15, 2018. A variety of activities were held across the country to greet the annual day for science popularization in China. (Xinhua/Wang Xiao)
