A staff of National Institute of Metrology demonstrates to journalists how to establish length measure standard at the institute in Beijing, capital of China, Aug. 18, 2008. The institute provides standard samples for food safety monitoring and doping tests, and provides measurement standards for the supervision of electromagnetic environment of the Olympic venues during the Beijing 2008 Olympic Games. (Xinhua/Li Wen) Photo Gallery>>>

Journalists take photos and shoot foortages of the representatives of the volunteers at a press conference about the voluntary services for the Beijing Olympic Games, at the 2008 Beijing International Media Center (BIMC) in Beijing, China, Aug. 18, 2008. A total of 1.7 million volunteers serve for the Beijing Olympics, among whom the oldest one is 103-year-old, according to the press conference. (Xinhua/Xu Liang) Photo Gallery>>>