Chief Executive of Macao Special Administrative Region (SAR) Chui Sai On (C) presides over the opening ceremony of a science popularizing activity promoting low-carbon technologies in Macao, south China, July 1, 2011. (Xinhua/Cheong Kam Ka)
High school students work on their robot at a science popularizing activity promoting low-carbon technologies in Macao, south China, July 1, 2011. (Xinhua/Cheong Kam Ka)
A high school student shows a robot at a science popularizing activity promoting low-carbon technologies in Macao, south China, July 1, 2011. (Xinhua/Cheong Kam Ka)