vi.

1. 作出，工作；運作；運轉
   The machine is not operating properly.

   機器運轉得不正常。

2. 營業，營運[Q]
   His company operates in several countries.

   他的公司在幾個國家有業務活動。

3. 起作用，影響，產生效果[Q]
   The medicine operated quickly.

   這藥很快起作用。

4. 動手術，開刀[（+on/for）]
   The surgeon operated on her for a tumor.

   醫生為她的腫瘤開刀。

5. 作戰；執行任務
6. 操作股票

vt.

1. 操作；開動（機器等）
   Who operates that machine?

   那臺機器由誰操作？

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

   那家百貨公司經營得法。

3. 對……施行手術；對……開刀
   He'll have to be operated for his tumors.

   他的腫瘤得開刀。

4. 引起，產生

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.