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A student tries oxygen mask during an activity in Hangzhou, capital of east China's Zhejiang Province, Nov. 9, 2017. An activity was held here to greet the fire prevention information day on Thursday. (Xinhua/Huang Zongzhi)
A student tries oxygen mask during an activity in Hangzhou, capital of east China's Zhejiang Province, Nov. 9, 2017. An activity was held here to greet the fire prevention information day on Thursday. (Xinhua/Huang Zongzhi)