Photo taken on April 29, 2013 shows a covered bridge in rain in Ya'an City, southwest China's Sichuan Province. According to China Meteorological Administration, Ya'an is one of the most rainy city in Sichuan in May. Experts remind on secondary disasters in Ya'an, which was hit by a 7.0-magnitude earthquake on April 20, 2013. (Xinhua/Lu Peng)