在华盛顿的核安全峰会上，美国总统奥巴马宣布，世界各国已经采取了“具体”的措施来防止恐怖分子的核袭击。但他补充说道，获得核武器的伊斯兰国将会是“对全球安全的最大威胁之一”。
The world has taken "concrete" steps to prevent nuclear terrorism, President Obama told the Nuclear Security Summit in Washington. But the so-called Islamic State (IS) obtaining a nuclear weapon is "one of the greatest threats to global security," he added.
共有超过50个国家的代表出席了本次的核安全峰会。
More than 50 nations were represented at the summit.
世界各国领导人在华盛顿召开的会议上，对朝鲜核武器项目以及俄罗斯的缺席表示密切关注。总统奥巴马表示，他对俄罗斯通过减少核武器开支，从而增强常规军事力量的做法感到担忧。
World leaders convening in Washington for the summit expressed concern about North Korea's nuclear weapons programme and Russia's lack of attendance. Mr Obama expressed concern that Russia has been building up its military at the expense of nuclear arms reductions.
俄罗斯总统普京拒绝出席本次峰会。巴基斯坦总理纳瓦兹·谢里夫在发生拉合尔自杀式爆炸袭击事件之后，也取消了他的华盛顿之行。而俄罗斯和巴基斯坦都是核武国。
Russian President Vladimir Putin refused to attend the summit, and Prime Minister Nawaz Sharif of Pakistan cancelled his trip after the deadly bombing in Lahore. Both countries are nuclear-armed.
之后，奥巴马总统汇报了使全世界更大范围无核化工作的进展。他指出，南美已经实现了无核化，而今年晚些时候中欧和东南亚地区也能做到这一点。
Mr Obama cited progress in making large parts of the world free of nuclear materials. South America had already achieved this, and Central Europe and South East Asia were expected to do so later this year.
他说：“我们已经齐心协力地清除了全世界大部分核设施里的致命材料。”
"Together, we have removed the world's most deadly materials from nuclear facilities around the world," he said.
奥巴马还指出，尽管他们取得了许多成绩，但是他们本可以在印度半岛和朝鲜半岛防止核扩散问题上做得更好。
Despite these gains, Mr Obama said the Indian subcontinent and the Korean peninsula were areas where more could be done to combat proliferation.
目前IS已经在叙利亚使用了化学武器。奥巴马对此表示：“如果这些疯子得到了核弹或者核材料，那么，毫无疑问他们将会尽其所能地用它来杀死更多的人。对付恐怖分子核袭击唯一最有效的防御方法就是，将核材料置于完全监管之下，以确保其不会落入邪恶势力的掌控。”
IS has already used chemical weapons in Syria. "There is no doubt that if these mad men ever got their hands on a nuclear bomb or nuclear material, they would certainly use it to kill as many people as possible," he said. "The single most effective defence against nuclear terrorism is fully securing this material so it doesn't fall into the wrong hands in the first place."