He resolutely refused to speak English unless forced to.
除非被逼迫,他堅決拒絕說英語。
Why did you need a room unless you were up to something?
除非你要搗什么鬼,不然為什么需要一個房間呢?
Recovery can't be sustained unless more jobs are created.
除非有更多的工作機(jī)會被創(chuàng)造出來,否則復(fù)蘇無法保持下去。