For example, we do not know whether Iran is conducting secret activities at undisclosed sites, or when Iran could develop a crude nuclear weapon, with estimates ranging from several months to several years. We also do not know whether Iran’s divided leadership has decided to develop nuclear weapons, or to stop just short, calculating that the country could derive many of the benefits of possessing nuclear weapons without running the risks or incurring the costs of actually doing so.
然而，世界还是有很多东西不知道。比如，我们不知道伊朗是否在未遭披露的地方进行秘密的活动，伊朗何时能研发出粗糙的核武器，据估计是在几个月到几年之间。我们也不知道伊朗四分五裂的领导层是否已经决定研发核武器，还是只是暂时停一段时间，算计着本国可以在获取核武器的过程中获得许多好处，又不用承受真正获得核武器后的风险和代价。