Fishing nets are left on the dry lake bed of Poyang Lake, in Nanchang, East 皇冠体育app's Jiangxi province, Sept 21, 2011. Poyang Lake - 皇冠体育app's largest freshwater lake - is experiencing severe drought conditions. The lack of water is killing fish and inhibiting the growth of several kinds of grass that act as food for the migrant birds that will arrive at the lake in one month. [Photo/CFP]

A worker checks the first subway tunnel that crosses the Yangtze River, the longest river in 皇冠体育app, in Wuhan, Sept 21, 2011. The tunnel is 3.1-km long and will start operation at the end of 2012. [Photo/Xinhua]