A folk artist demonstrates the making of Peking Opera masks during the exhibition "This is Beijing" inside China National Convention Center, a venue of the 2014 Asia-Pacific Economic Cooperation (APEC) Economic Leaders' Week, in Beijing, capital of China, Nov. 7, 2014. The exhibition "This is Beijing" displays the culture, tradition and scientific innovation of China's capital city. (Xinhua/Luo Xiaoguang)