Képeken a világ leghatalmasabb munkagépei

(210331) -- PINGTANG, March 31, 2021 (Xinhua) -- Aerial photo taken on March 31, 2021 shows China's Five-hundred-meter Aperture Spherical Radio Telescope (FAST) under maintenance in southwest China's Guizhou Province. China's FAST officially opened to the world starting Wednesday. (Xinhua/Ou Dongqu) (Photo by Ou Dongqu / XINHUA / Xinhua via AFP)