A child looks out a train window at Hefei Railway Station, in the capital city of East China's Anhui province, July 19, 2011. As summer vacation period has arrived many children are passing through Anhui’s Heifei Railway Station as the region is one of the main sources of migrant workers. These children, like the migratory birds, leave their hometowns to travel to their parent’s workplace at the beginning of the vacation for a family reunion and then return back home when the vacation ends.[Photo/Xinhua]