新东方网英语四级频道为备考英语四级的同学整理了英语四级词汇讲解及考点归纳，希望可以为大家带来帮助，一起来学习一下吧。
英语四级词汇讲解丨考点归纳：unless
We won’t be able to win unless we get the majority votes from the womenstudents.
四级词汇讲解:
unless意为“除非”，表示让步或者条件。如:
She won't be happy unless you accompany her all the time.除非你一直陪着她，不然她会不开心。
英语四级考点归纳：
unless与if…not都可以译为‘’要是(不)”，但是二者在用法和含义上并非完全等同。如：
※ Unless she had noticed this，the world would have lost one of the greatest discoveries of thecentury.(=If she had not noticed this，the world would have lost one of the greatest discoveriesof the Century.)假如她没有注意到这一点，世界就会失去一项那个世纪最伟大的发现。
※ Unless I were a teacher, I would not concern myself with your morality.我又不是 老师，不会关心你的道德品质。
If I weren't a teacher, I would not concern myself with your morality.假如我不是老师的话，我就不会关心你的道德品质了。(实际上我是老师，因此要关心你的道德品质。)
From:https://www.zgghmh.com/CET-4/20004064.asp