operative

名词 operative:

1. a person secretly employed in espionage for a government
   同义词：secret agent, intelligence officer, intelligence agent
2. someone who can be employed as a detective to collect information
   同义词：private detective, PI, private eye, private investigator, shamus, sherlock

形容词 operative:

1. being in force or having or exerting force
2. of or relating to a surgical operation
3. relating to or requiring or amenable to treatment by surgery especially as opposed to medicine
   同义词：surgical
4. effective; producing a desired effect
   同义词：key
5. (of e.g. a machine) performing or capable of performing
   同义词：running, functional, working

1. This law becomes operative on 12 May.
   此法令自5月12日起生效。
2. The boss is hopping mad about it and `mad' is the operative word.
   老板对此事暴跳如雷--｀暴跳如雷＇这个成语在句中最重要。
3. The oil rig is now fully operative.
   石油钻塔现全面开工。
4. The station will be operative again in January.
   该车站将於一月份恢复使用。