A 200-meter running track built on the rooftop of a primary school in Taizhou City, Zhejiang province, is put into use on Monday, September 1, 2014, as the new semester begins. The headmaster, Qiu Tianguo, says the track, with five lanes, will facilitate outdoor activities for more than 1,600 students at the school that is surrounded by residential buildings and has limited playground space. .[Photo/Chinanews.com]