Visitors select aquatic products during the second China-Africa Economic and Trade Expo in Changsha, capital of central China's Hunan Province, Sept. 27, 2021. The second China-Africa Economic and Trade Expo opened Sunday in Changsha. The four-day event, online and offline, has attracted nearly 900 enterprises from nearly 40 African countries and China, according to the organizers. (Xinhua/Chen Sihan)