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。

youdao

Together, we must cooperate to secure all vulnerable nuclear materials around the world, which will be a focus of our Global Nuclear Summit next year.

我们必须共同努力，保障世界各地所有危险核材料的安全，这将是我们明年要举办的全球核问题峰会（Global Nuclear Summit）的一个重点议题。

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America would host a summit on nuclear security within the next 12 months.

美国将在接下来的12个月之内举办一次关于核安全的峰会。

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Progress on a work plan for securing nuclear materials can be discussed when South Korea holds the next summit in two years.

VOA: special.2010.04.17

Leaders from forty-seven countries gathered in Washington for President Obama's Nuclear Security Summit.

VOA: special.2010.04.17

One country that did not attend the Nuclear Security Summit was Iran.

VOA: special.2010.04.17

Mr Obama and Mr Medvedev met during a nuclear summit in the South Korean capital Seoul.

BBC: Obama and Medvedev caught in unguarded missile remarks

Obama said the two leaders are discussing holding a global nuclear summit next year.

CNN: Obama moves to bolster U.S.-Russia ties

But Malaysia cut off gasoline exports ahead of the bilateral meeting between Malaysian Prime Minister Najib Razak and U.S. President Barack Obama during the Nuclear Summit in Washington early in the week of April 11.

FORBES: China Boosts Gas Sales to Iran, Irks U.S.