An attendant robot is shown during a competition on May 21, 2011. A competition of attendant robots is held in University of Science and Technology of China (USTC), in Hefei, Anhui province, from May 20 to 22. More than 20 teams from universities such as USTC, Shanghai Jiao Tong University, Sun Yat-Sen University, take part in the competition. [Photo/Xinhua]