普林斯顿—军事组织伊拉克和叙利亚伊斯兰国（Islamic State in Iraq and Syria，ISIS）最近宣言要建立一个哈里发帝国，这是现代社会前所未有的事件。
PRINCETON – The recent declaration of a caliphate by the militant group the Islamic State in Iraq and Syria (ISIS) is an unprecedented event in modern times.