unless

Unless some extra money is found, the theatre will close..要是不能找到更多资金，剧院将要关闭。

I think you should complain – unless, of course, you are happy with the way things are..我觉得你应该发发牢骚——当然，除非你对现状很满意。

He won’t go to sleep unless you tell him a story..要是你不给他讲故事他就不睡觉。

I can’t leave her unless I know she’s all right..除非我知道她没事，否则我不能离开她。

unless and until,直到…才