unless /ʌnˈlɛs/ CET4 TEM4

• 1. 

  CONJ 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

  例：

  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。

  例：

  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。