内容摘要：A staff member works at the control room of China's Five-hundred-meter Aperture Spherical radio Tele

　　

　　A staff member works at the control room of China's Five-hundred-meter Aperture Spherical radio Telescope (FAST) in southwest China's Guizhou Province, March 27, 2021. FAST has identified over 300 pulsars so far. Located in a naturally deep and round karst depression in southwest China's Guizhou Province, it officially began operating on Jan. 11, 2020. (Xinhua/Ou Dongqu)