Photo taken on Sept. 27, 2016 shows Sang Lei (1st R) explaining lessons to his students at night 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. 27, 2016 shows Sang Lei (1st R) explaining lessons to his students at night at Pengdang Primary School,in Nujiang Lisu autonomous prefecture of Southwest China's Yunnan province. (Photo/Xinhua)
