A group of combined harvesters reap wheat in the wheat field, at Yanhu District, Yuncheng City, north China's Shanxi Province, May 21, 2009. The local agricultural department mobilizes some 3,000 combined harvesters and other farming machinery to launch on the massive summer seasonal harvesting to over 4.8 million mu of wheat plantation, in addition to the voluntary maintenance service to the bulky number of farm machines operating in the fields. [Xue Jun/Xinhua]