US President Barack Obama did capture global attention with his Prague speech in 2009, which made a compelling case for a nuclear weapon-free world. And he did deliver on a major new arms-reduction treaty with Russia, and hosted a summit aimed at reducing the vulnerability of nuclear weapons and materials to theft or diversion.
美国总统巴拉克·奥巴马2009年的布拉格讲话确实引起了全球的关注，这次讲话令人信服地强调了建设无核武器世界的重要性。奥巴马也的确与俄罗斯签订了大规模全新削减武器条约，并且举办了一次应对核武器及材料被盗或偏离危险的首脑峰会。