按照鲁哈尼和维拉雅迪的说法，尽管近几年来伊朗增加了核研究计划中离心机的使用数量，其成本之高在国际制裁下成为一场经济噩梦。
According to Rowhani and Velayati, while Iran in recent years has increased the number of centrifuges in use in its nuclear research program, the cost has been an economically devastating array of international sanctions.