He Yujiu (L, front), an 81-year-old folk artist, teaches his students at a primary school in Maqiao Township of Huantai County, east China's Shandong Province, Feb. 25, 2016. He, who learned to perform as a monkey in the opera since 16 years old, held a class in the school in 2013, to teach children performing skills. (Xinhua/Guo Xulei)