ad hoc group

基本解释

Pathfinder also carried out ad hoc group activities, such as tour hotel and corporate's folk culture and so on.
探路者协会还不定期的开展集体活动。如参观酒店、企业文化游、民俗文化游、等等。
blog.sina.com.cn
The source revealed that the ad hoc group will examine the existing laws on sedition, and to explore how to extend to the Internet.
消息透露，专案小组将研究现有的煽动法令，并探讨如何将其延伸至互联网。
The authority should be set up under the auspices of the UN or of an ad hoc group (the United States, Canada, the European Union and Brazil, for example).
该临时机构应该在联合国或一个特别小组（如美国、加拿大、欧盟和巴西）的支持下建立。

The Ad Hoc Group was charged with addressing the science-related recommendations of the report.
UNESCO: Social and Human Sciences
If that decision had been made by a standing group of experts instead of an ad hoc group, it would have drawn less scrutiny.
FORBES: Magazine Article
Ban Ki-Moon, United Nations Secretary-General, tasked Irina Bokova to convene an Ad Hoc Group to advise him on the science-related recommendations of the Report.
UNESCO: Public policies need social sciences to build a green sustainable society