barring

They'll be at sea for six months, barring medical emergencies. [=they'll be at sea for six months if there are no medical emergencies]除非出现紧急医疗事故，否则他们将要出海六个月。

She's going to lose the election barring a miracle. [=unless a miracle occurs]她将落选，除非出现奇迹。

No one, barring the magician himself, knows how the trick is done.除了魔术师本人之外，没人知道这个戏法是怎么完成的。