Trucks block the road outside the Washington Convention Center prior to the Nuclear Security Summit in Washington, capital of the United States, April 12, 2010. [Zhang Jun/Xinhua]
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![Trucks block the road outside the Washington Convention Center prior to the Nuclear Security Summit in Washington, capital of the United States, April 12, 2010. [Zhang Jun/Xinhua]](http://images.china.cn/attachement/jpg/site1007/20100413/000cf1bdd03f0d2e1cce22.jpg "Trucks block the road outside the Washington Convention Center prior to the Nuclear Security Summit in Washington, capital of the United States, April 12, 2010. [Zhang Jun/Xinhua]")
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