task force
(亦作task group)
noun
1- an armed force organized for a special operation特遣部队。
1.1
- a unit specially organized for a task（为某项任务而成立的）特别行动组; 专门委员会：
the government has set up a task force to survey mental health services.
政府已经成立了一个专门委员会来调查精神病防治设施。