Aerial photo taken on March 20, 2019 shows a tunnel in Boao Town of Qionghai City, south China's Hainan Province. This year's annual conference of the Boao Forum for Asia (BFA), scheduled from March 26 to 29 in Boao, a coastal town in China's southern island province of Hainan, will be themed "Shared Future, Concerted Action, Common Development." (Xinhua/Guo Cheng)