Chinese Vice Premier Wang Qishang(L5), Chinese State Councilor Dai Bingguo(L1), U.S. State Secretary Hillary Clinton (L4) and U.S. Treasury Secretary Timothy Geithner(R1) unveil the model of the U.S. National Pavilion for the 2010 Shanghai World Expo at the U.S. State Department in Washington, July 27, 2009. (Xinhua/Zhang Yan)
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