Li Xiang, a history teacher of Xishan School of the High School Affiliated to Renmin University of China, teaches online class at home in Beijing, capital of China, April 13, 2020. Since primary and high schools in Beijing were ordered to postpone spring semesters over coronavirus concerns, local educational authority has urged to establish mechanisms for students of studying online from home to accommodate continuous efforts in epidemic prevention and control. (Xinhua/Ju Huanzong)

Ma Zihan, a third grader of a primary school in Chaoyang District, previews Chinese lessons at home in Beijing, capital of China, April 13, 2020. Since primary and high schools in Beijing were ordered to postpone spring semesters over coronavirus concerns, local educational authority has urged to establish mechanisms for students of studying online from home to accommodate continuous efforts in epidemic prevention and control. (Xinhua/Ju Huanzong)

Li Xiang, a history teacher of Xishan School of the High School Affiliated to Renmin University of China, teaches online class at home in Beijing, capital of China, April 13, 2020. Since primary and high schools in Beijing were ordered to postpone spring semesters over coronavirus concerns, local educational authority has urged to establish mechanisms for students of studying online from home to accommodate continuous efforts in epidemic prevention and control. (Xinhua/Ju Huanzong)

Ma Zihan, a third grader of a primary school in Chaoyang District, attends an online class meeting from home in Beijing, capital of China, April 13, 2020. Since primary and high schools in Beijing were ordered to postpone spring semesters over coronavirus concerns, local educational authority has urged to establish mechanisms for students of studying online from home to accommodate continuous efforts in epidemic prevention and control. (Xinhua/Ju Huanzong)