CHENGDU, May 25 (Xinhua) -- The 20th Western China International Fair opened in Chengdu, southwest China's Sichuan Province, on Sunday under the theme of "Deepen Reform For More Momentum, Expand Openness for Greater Growth." The fair, which is hosted by the People's Government of Sichuan Province, has attracted over 3,000 enterprises from home and abroad, and will last until May 29. Hungary and Laos serve as the guest countries of honor at the fair, while east China's Zhejiang Province and northwest China's Qinghai Province act as the guest provinces of honor.