Peng Liyuan (L), wife of Chinese President Xi Jinping, and World Health Organization goodwill ambassador for tuberculosis and HIV/AIDS and UNESCO special envoy for the advancement of girls' and women's education, and Panamanian First Lady Lorena Castillo Garcia, special ambassador for UNAIDS in Latin America, pose for photos holding colorful paper butterflies, which symbolize the Zero Discrimination campaign, to show their solid support for the global cause against AIDS in Panama City, Panama, Dec. 3, 2018. Peng met with Castillo on Monday. They jointly attended a publicizing activity on AIDS prevention and treatment. (Xinhua/Yan Yan)