B2 noun ˌvɒlənˈtɪər ˌɔːɡənaɪˈzeɪʃən
volunteer organization
志愿者组织
Meaning
A nonprofit group of people who offer their services willingly without payment for a cause.
Example
BD Clean is a volunteer organization promoting recycling.
BD Clean 是一个志愿者组织,推广回收。