For years, Washington's approach to Tehran's program has been one of attempting "to put time on the clock," a senior administration official said, even while refusing to discuss Stuxnet.

某高级官员说，多年来，华盛顿认为德黑兰的计划是企图“校定时钟”，甚至在拒绝讨论超级工厂病毒时也是这样想。