working group
noun [ C, + sing/pl verb ] uk/ˈwɜː.kɪŋ ˌɡruːp/ us/ˈwɝː.kɪŋ ˌɡruːp/ (UK also working party)
（负责对某一问题或情况进行调查研究，并提交报告和建议的）专题调查委员会，特别工作组
a small group of people, for example one chosen by a government, that studies a particular problem or situation and then reports on what it has discovered and gives suggestions