Yang Jiechi (4th L, front), a member of the Political Bureau of the Communist Party of China (CPC) Central Committee and director of the Office of the Foreign Affairs Commission of the CPC Central Committee, poses for a group photo with delegates to the 3rd Understanding China Conference before the opening ceremony of the conference in Beijing, capital of China, Dec. 16, 2018. President Xi Jinping sent a congratulatory letter to the 3rd Understanding China Conference which opened in Beijing on Sunday. (Xinhua/Zhang Ling)