我们知道恐怖组织有能力制造核武器，并成功地在任何地方引爆；我们只是无法确信能让他们永远得不到为核武器提供燃料的可裂变物质。
We know that terrorist groups have the capacity to engineer nuclear devices and would explode them anywhere they could; we simply cannot be confident that we can forever deny them access to the fissile material they need to fuel them.