A humanoid robot known as "Nao" performs during the 11th China International Equipment Manufacturing Exposition in Shenyang, capital of northeast China's Liaoning Province, Sept. 1, 2012. A total of four humanoid robots, which can sing, dance and even demonstrate the popular martial art Tai chi, were displayed during the Exposition. [Photo/Xinhua]

Newly enrolled primary school students dressed in traditional Chinese costumes strike a bell during a ceremony to pledge the start of their journey towards learning knowledge and etiquette at a Confucian temple in Nanjing, Jiangsu province Sept 1, 2012. [Photo/Agencies]