Pupils have a lesson at a primary school in Shuijiang Township of Nanchuan District in Chongqing, southwest China, Jan. 4, 2018. Nanchuan strengthened integrated development of compulsory education between urban and rural areas in the past two years. A total of 86 schools were built or rebuilt in 2016 and 2017 in Nanchuan. (Xinhua/Wang Quanchao)