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Workers do the final preparation work in the Washington Convention Center in Washington D.C., capital of the United States, April 11, 2010. The Nuclear Security Summit will be held at the Washington Convention Center on April 12 and 13.[Zhang Jun/Xinhua]
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![Workers do the final preparation work in the Washington Convention Center in Washington D.C., capital of the United States, April 11, 2010. The Nuclear Security Summit will be held at the Washington Convention Center on April 12 and 13.[Zhang Jun/Xinhua]](http://images.china.cn/attachement/jpg/site1007/20100412/000cf1bdd03f0d2cc58f08.jpg "Workers do the final preparation work in the Washington Convention Center in Washington D.C., capital of the United States, April 11, 2010. The Nuclear Security Summit will be held at the Washington Convention Center on April 12 and 13.[Zhang Jun/Xinhua]")
