unless [ʌnˈlɛs]

例句:

• Training is worthless unless there is proof that it works.
  除非能证明训练有效，否则就是白搭。
  来自柯林斯例句
• Don't offer advice unless they ask for it.
  来自BBC
• The targets would not be achieved unless other departments showed equal commitment.
  除非其他部门同样努力，否则这些目标无法达成。
  
• The South African mailboat arrived on Friday mornings unless bad weather intervened.
  除非受恶劣天气干扰，南非邮船一般在星期五上午抵达。
  
• Never pick a leveret up unless it is injured.
  来自BBC
• Fishing cannot survive unless people buy the fish.
  来自BBC
• Don't ask me to explain unless you really don't understand.
  不要叫我解释,除非你真的不懂。
  来自《权威词典》
• I will be very angry unless you have already spoken to her.
  除非你已经对她说过了,否则我会很生气。
  来自《权威词典》
• I won't write unless he writes first.
  除非他先写信,否则我就不写。
  来自《权威词典》