Chinese Premier Wen Jiabao (2nd R) and leaders from Association of Southeast Asian Nations (ASEAN) member nations attend the opening ceremony of the 8th China-ASEAN Expo in Nanjing, capital of South China's Guangxi Zhuang autonomous region October 21, 2011. [Photo/Xinhua]

Wang Zhengdong patrols on a grass slope in Luoshan, Northwest China's Ningxia Hui autonomous region Oct 21, 2011. Wang, a potroller of Luoshan National Nature Reserve Administration, has been working at the grassland for over 20 years, in charge of duties such as eliminating fire risks and pest and disease detection. Though surrounded by desertified land, Luoshan is one of the three natural forest areas in Ningxia. [Photo/Xinhua]