From Washington, this is VOA NEWS. President Obama calls for a world free of nuclear weapons. Afghanistan cancels security talks with the United States. I'm Ray Kugel reporting from Washington. President Obama set forth his vision for advancing toward a world free of nuclear weapons in a speech Wednesday at the historic Brandenburg Gate in Berlin. _________________________美国之音新闻,发自华盛顿. 美国总统奥巴马呼吁世界无核武器.阿富汗取消了与美国的安全会谈.雷.库格在华盛顿报道. 美国总统奥巴马周三在柏林著名的布兰登堡门讲话时,提出了世界无核化的愿景._____________________
