Students design and assemble robots during the 2014 Xi'an Robotic Carnival in Xi'an, capital of northwest China's Shaanxi Province, Aug. 8, 2014. The three-day robotic carnival kicked off Friday at Xi'an's Qujiang International Convention and Exhibition Center, featuring a number of highlights including home/school-use robots, bionics, robotic labs, 3D-printing devices and multimedia interaction devices. (Xinhua/Liu Xiao)