Participants of the high school group compete during the 12th China Adolescent Robotics Competition in north China's Tianjin Municipality, July 18, 2012. The Competition, which kicked off on Wednesday, attracts nearly 3,100 participants from 519 teams all over China. (Xinhua/Zhang Chaoqun)

A participant debugs his robot before competing in the 12th China Adolescent Robotics Competition in north China's Tianjin Municipality, July 18, 2012. The Competition, which kicked off on Wednesday, attracts nearly 3,100 participants from 519 teams all over China. (Xinhua/Zhang Chaoqun)

Young participants debug their robots at the 12th China Adolescent Robotics Competition in north China's Tianjin Municipality, July 18, 2012. The Competition, which kicked off on Wednesday, attracts nearly 3,100 participants from 519 teams all over China. (Xinhua/Zhang Chaoqun)

Two participants of high school group operate their robot during the 12th China Adolescent Robotics Competition in north China's Tianjin Municipality, July 18, 2012. The Competition, which kicked off on Wednesday, attracts nearly 3,100 participants from 519 teams all over China. (Xinhua/Zhang Chaoqun)