unless

除非，如果不英释中释conjused to say that something will happen or be true if something else does not happen or is not true

除…之外中释prep

1 unless and until,直到…才

1 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。

2 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。

3 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。

4 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。