Areas of Washington have been shut down due to security measures designed to protect leaders from 47 nations gathered for the nuclear summit.

为了保护参加核峰会的47个国家的领导人，美国首都华盛顿采取安全措施，一些地方禁止行人车辆通过。

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Oil-rich Middle Eastern nations are rushing to build new nuclear plants.

富产石油的中东国家正急匆匆地建立新的核电站。

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Discussions about Iran's nuclear activities have intensified among the five permanent United Nations Security Council members and Germany.

VOA: special.2010.04.17

Western nations are concerned that Iran could use the missile technology to launch a nuclear weapon, which Iran is suspected of building.

VOA: special.2009.02.07

They also urged Iran to honor the United Nations demands to stop enriching uranium and open its nuclear program to international inspectors.

VOA: special.2009.02.07

The company has also talked to other nuclear nations such as India and Russia about its 4G research.

BBC: China and Bill Gates discuss nuclear reactor plan

In 2006, the administration created the Global Nuclear Energy Partnership, an international program among nuclear nations that, among other things, seeks to develop ways to reprocess spent nuclear fuel.

FORBES: The World's Most Nuclear Nations

The document will more clearly say the U.S. will not attack non-nuclear nations that have signed and are complying with the U.N. nonproliferation treaty, according to officials familiar with it.

WSJ: U.S. Keeps First-Strike Nuclear Strategy