Hu Zhisheng writes on the blackboard at Yantai primary school in Yantai Village of Lianhua Township in Tieling City, northeast China's Liaoning Province, Jan. 7, 2019. Located in a remoted mountain village, most students of Yantai school had transferred to other places outside the mountain. Sun Xiaofeng, a third grade student, became the only student of the school in September last year taught by Hu Zhisheng, the only one faculty of Yantai primary school. (Xinhua/Yao Jianfeng)