He Yujiu (R, 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 monkey in the opera since 16 years old, held a class in the school in 2013, to teach children performing skills. [Photo/Xinhua]