(101229) -- BEIJING, Dec. 29, 2010 (Xinhua) -- An armed soldier keeps guard during the Spring Festival travel season at Beijing West Railway Station in Beijing, capital of China, Feb. 10, 2010. The annual Chinese Spring Festival created the largest human migration flow between urban and rural areas in the world. By the end of 2009, China's urbanization rate has reached 46.6 percents. Population expansion, traffic congestion, resource shortage and some others problems obsessed more and more urban residents. In the next five years, China's urban population is expected to reach 700 million and overtake its rural population due to massive rural-to-urban migration. (Xinhua/Gong Lei) (mcg/zgp)
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