Visitors stand before the pavilion of China's Ningbo Wind Power Technology Corporation during the Wind Power 2009 Conference and Exhibition in Chicago, Illinois, the United States. on May 5, 2009. The Wind Power 2009 Conference and Exhibition, taking place from May 4 to 7, featurs the lastest industry development and technologies of wind energy professionals from the US, Germany, Norway, Korea, China and so forth. [Xinhua]