Guo Yue writes on the blackboard as he teaches during a class in Guozhai Primary School, Taihe County of east China's Anhui Province, Sept. 7, 2018. Guo, suffering a chronic loss of eyesight due to an illness a few years after he began his career as teacher in 1986, managed to keep teaching in the school. Almost totally blind, Guo also teaches in music and ethical education classes in addition to Chinese. (Xinhua/Zhang Duan)