Former Philippine President Joseph Estrada (C), who is running for mayor of the city of Manila, casts his vote at a polling station in Manila, the Philippines, May 13, 2013. The Philippine midterm elections started at polling locations across the country early Monday morning. (Xinhua/Rouelle Umali)

A player from the Shanghai Sharks dunks as Filipine boys watch during a basketball clinic in Pasig City, the Philippines, May 5, 2013. Yao and his Shanghai Sharks are in Manila on a friendly visit. They will attend two exhibition games respectively with the Smart Gilas Team and the Philippine Basketball Association (PBA) Selection. (Xinhua/Rouelle Umali)

Girls wearing bikinis form a snake-shaped "2013" during a "Ten Thousand People Bikini Show" at the Chimlong Water Park in Guangzhou, capital of south China's Guangdong Province, May 5, 2013. (Xinhua/Liu Dawei)

Dancers perform in the rehearsal of the musical Hundred-bird Dress in Nanning, capital of south China's Guangxi Zhuang Autonomous Region, April 27, 2013. The musical tells a legend of the Zhuang ethnic group about a young hero's sacrifice in protecting the homeland against an evil polluting power. (Xinhua/Liu Jun)

Models present fashion creations designed by Gao Lixin during the 2013 China (Qingdao) International Fashion Week in Qingdao, a coastal city in east China's Shandong Province, May 5, 2013. (Xinhua/Li Ziheng)

A huge rubber duck floats on the waters at the Victoria Harbor in Hong Kong, south China, May 2, 2013. The largest rubber duck was created by Dutch artist Florentijn Hofman, with 18 meters of length, 15 meters of width and height. The duck has visited 12 cities since 2007. (Xinhua/Lui Siu Wai)

Chinese State Councilor Yang Jiechi (C front) poses for a group photo during his meeting with a delegation of Richard Nixon Foundation headed by Christopher Cox, a grandson of former U.S. President Richard Nixon, in Beijing, capital of China, May 3, 2013. (Xinhua/Xie Huanchi)

Image provided by Honduras' Presidency shows U.S. President Barack Obama (5th L), Costa Rican President Laura Chinchilla (5th R) and other state and government chiefs waving during arrival to an event at National Theatre in San Jose, capital of Costa Rica, May 3, 2013. U.S. President Barack Obama and Central American state and government chiefs arrived to Costa Rica on Friday before they attend summit of the Central American Integration System (SICA, by its acronym in Spanish). (Xinhua/Honduras' Presidency)

An athlete walks with his surfboard on a beach in Montanita, Ecuador, on April 13, 2013. More than 120 surfers from all over the world attend a surfing competition called Surf World held here from April 6 to 16. (Xinhua/Str)

Ferrari driver Fernando Alonso races during the Formula One Chinese Grand Prix at the Shanghai International circuit, in Shanghai, east China, on April 14, 2013. (Xinhua/Fan Jun)