CHENGDU, Oct. 12, 2002 (Xinhuanet )-- A girl from the ethnic Yi Autonomous County of Sichuan Province introduces a kind of green food to visitors to the Sichuan Western Agriculture Expo opened in Chengdu, capital of southwest China's Sichuan Province, Oct. 11, 2002. Local visitors and representatives from the United States, Canada and Israel took part in the expo.