英 [ənˈles] 美 [ənˈles]
conj. 除非，除非在……情况下；若非，如果不
prep. 除……之外；除……之外
unless /ʌnˈlɛs/ CET4 TEM4
连词 You use unless to introduce the only circumstances in which an event you are mentioning will not take place or in which a statement you are making is not true. 除非; 如果不
Unless you are trying to lose weight to please yourself, it's going to be tough to keep your motivation level high.
除非你在为了让自己开心而努力减肥，否则要保持驱动力很高将很难。
We cannot understand disease unless we understand the person who has the disease.
除非我们了解有某种疾病的人，否则我们不会了解疾病。
Unless, first published by Fourth Estate, an imprint of Harper Collins in 2002, is the final novel by Canadian writer Carol Shields. Semi-autobiographical, it was the capstone to Shields's writing career: she died shortly after its publication in 2003.
除非
除非(Unless)方今火箭能够找到一个(A)年青的全明星外线，”章明基说，“末了的 结 (Results)果（是否(Whether)生意）是良多身分罗列拼凑的结果...
如果不,除非 (1)unless“除非,如果不”,用来引导条件状语从句,相当于if..
unless 假如不，除非 引导条件状语从句 i won’t write unless he writes first. 除非他先写要不我不写 .
作别(Unless)绿茵的云彩 理想是指路明灯。
除…之外
Unless she loses some weight, she's had it.
除非她减掉一些体重，否则她就完蛋了。
That's the plan—unless anything untoward happens.
计划就这么定了—除非出现异常情况。
He resolutely refused to speak English unless forced to.
除非被逼迫，他坚决拒绝说英语。
But the president did not agree. He said this 2nd bill would also be vetoed unless changes were made in it.
VOA : special.2009.01.29
STUDENT: No. Not unless he wants to break the vase into little pieces and stuff it in the corners.
学生：【听不见】,教授：不，除非它想把花瓶打成碎片,然后把它们堆到角落里。
计算机科学及编程导论课程节选 : 麻省理工公开课
I have never had any myself and I don't plan to unless I need to maybe in the future.
我自己没有整过。在将来，除非有必要，我也不打算去整容。
SpeakingMax英语口语达人 : 整容是个人自由
She used nothing they told her, however,unless she could prove it was true to the best of her ability.
VOA : special.2010.04.25
He was known for being so stingy he refused to spend any of his money, unless forced to do so.
VOA : special.2009.10.11
The report warned that unless the problem was addressed, businesses could be forced to move elsewhere.
BBC: NEWS | UK | England | London | Gateway skills shortage warning
Foreign journalists are not allowed into the country, unless they pretend to be tourists.
ECONOMIST: The hopes kindled by the saffron revolution have faded fast
The Appendix lists species which may become threatened with extinction unless trade is closely controlled.