ad-hoc

adj.

often improvised or impromptu

同义词：ad hoc

for or concerned with one specific purpose

同义词：ad hoc

1. The committee formed an ad-hoc group to address the urgent issue.
   委员会成立了一个临时小组来解决紧急问题。
2. They organized an ad-hoc meeting to discuss the unexpected situation.
   他们组织了一次临时会议来讨论突发情况。