Photo taken on Nov. 28, 2020 shows a model of China''s Five-hundred-meter Aperture Spherical radio Telescope (FAST) displayed during the 17th China-ASEAN Expo at Nanning International Convention and Exhibition Center in Nanning, south China''s Guangxi Zhuang Autonomous Region. The expo runs from Nov. 27 to 30 in Nanning. (Xinhua/Lu Boan)