Photo taken on Sept. 26, 2016 shows Sang Lei raising question at class at Pengdang Primary School, in Nujiang Lisu autonomous prefecture of Southwest China's Yunnan province. (Photo/Xinhua)
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Photo taken on Sept. 26, 2016 shows Sang Lei raising question at class at Pengdang Primary School, in Nujiang Lisu autonomous prefecture of Southwest China's Yunnan province. (Photo/Xinhua)
