World leaders commit to strengthen nuclear security
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![U.S. President Barack Obama speaks at a news conference after the two-day Nuclear Security Summit closed in Washington D.C., capital of the United States, April 13, 2010. [Zhang Jun/Xinhua]](http://images.china.cn/attachement/jpg/site1007/20100414/000cf1bdd03f0d2f5f0122.jpg "U.S. President Barack Obama speaks at a news conference after the two-day Nuclear Security Summit closed in Washington D.C., capital of the United States, April 13, 2010. [Zhang Jun/Xinhua]") |
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U.S. President Barack Obama speaks at a news conference after the two-day Nuclear Security Summit closed in Washington D.C., capital of the United States, April 13, 2010. [Zhang Jun/Xinhua] |
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