vi.

1. 作出，工作；运作；运转
   The machine is not operating properly.

   机器运转得不正常。

2. 营业，营运[Q]
   His company operates in several countries.

   他的公司在几个国家有业务活动。

3. 起作用，影响，产生效果[Q]
   The medicine operated quickly.

   这药很快起作用。

4. 动手术，开刀[（+on/for）]
   The surgeon operated on her for a tumor.

   医生为她的肿瘤开刀。

5. 作战；执行任务
6. 操作股票

vt.

1. 操作；开动（机器等）
   Who operates that machine?

   那台机器由谁操作？

2. 经营；管理
   The department store is well operated.

   那家百货公司经营得法。

3. 对……施行手术；对……开刀
   He'll have to be operated for his tumors.

   他的肿瘤得开刀。

4. 引起，产生

v.

1. (with reference to a machine, process, etc.) function or control the functioning of:
   market forces were allowed to operate freely.
2. (with reference to an organization) manage or be managed and run.
   ▸(of an armed force) conduct military activities.
3. be in effect.
4. perform a surgical operation.