1. The surgeon operated on her for a tumor.
   医生为她的肿瘤开刀。
2. Police speed traps are operating on this motorway.
   这条高速公路上有超速监测器
3. Several causes operated to bring on the war.
   好几个原因结合在一起引起了那场战争。
4. The two schools are co-operating on the project.
   这两所学校在这一项目上进行协作。
5. I'm afraid you'll have to be operated on for appendicitis.
   恐怕你得手术治疗阑尾炎。

　1个动词解释