Retired four-time Olympic diving champion Guo Jingjing (L) poses for photos with children in Hong Kong, south China, Jan. 25, 2014. Guo was appointed as UNICEF HK Ambassador on Saturday. (Xinhua/Lo Ping Fai)

Retired four-time Olympic diving champion Guo Jingjing (C) and Judy Chen (3rd L), chairwoman of Hong Kong Committee for the United Nations Children's Fund (UNICEF), extend New Year greetings to Hong Kong citizens in Hong Kong, south China, Jan. 25, 2014. Guo was appointed as UNICEF HK Ambassador on Saturday. (Xinhua/Lo Ping Fai)