Builders of the Three Gprges Project, the world's largest hydropower project, celebrate the completion of the concrete placement of the mammoth Three Gorges dam Saturday afternoon May 20, 2006.  (Xinhua Photo)

Li Yong'an, general manager of China Yangtze River Three Gorges Development Corp, declares the completion of concrete placement of the mammoth Three Gorges dam at a celebration held on the dam located in Hubei Province Saturday May 20, 2006.(Xinhua Photo)

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