Photo taken on April 13, 2013 shows the panda named "Hua Ao" at Yantai Zoo in Yantai City, east China's Shandong Province. The zoo splashed water for the two pandas"Qing Feng" and "Hua Ao" to keep them cool as the highest temperature in Yantai City reached 29 Celsius degree Saturday. (Xinhua/Shen Jizhong)

Photo taken on April 13, 2013 shows the panda named "Hua Ao" at Yantai Zoo in Yantai City, east China's Shandong Province. The zoo splashed water for the two pandas"Qing Feng" and "Hua Ao" to keep them cool as the highest temperature in Yantai City reached 29 Celsius degree Saturday. (Xinhua/Shen Jizhong)

Photo taken on April 13, 2013 shows the panda named "Qing Feng" at Yantai Zoo in Yantai City, east China's Shandong Province. The zoo splashed water for the two pandas"Qing Feng" and "Hua Ao" to keep them cool as the highest temperature in Yantai City reached 29 Celsius degree Saturday. (Xinhua/Shen Jizhong)

Photo taken on April 13, 2013 shows the panda named "Hua Ao" at Yantai Zoo in Yantai City, east China's Shandong Province. The zoo splashed water for the two pandas"Qing Feng" and "Hua Ao" to keep them cool as the highest temperature in Yantai City reached 29 Celsius degree Saturday. (Xinhua/Shen Jizhong)

Photo taken on April 13, 2013 shows the panda named "Hua Ao" at Yantai Zoo in Yantai City, east China's Shandong Province. The zoo splashed water for the two pandas"Qing Feng" and "Hua Ao" to keep them cool as the highest temperature in Yantai City reached 29 Celsius degree Saturday. (Xinhua/Shen Jizhong)