The charity has been an agent for social change.

这个慈善机构一直推动社会变革。

《牛津词典》

The primary point of contact is presumed to be the principal inside change agent for the client.

主要的联系人假设为客户的变更代理中的负责人。

youdao

He is a change agent supporting his team besides educating and socializing Scrum throughout the organization.

作为变更的代理人，他支持自己的团队，并将Scrum在组织中广为传播。

youdao

Wandell and Wehr say their change-agent days are far from finished.

WSJ: Driving Change Without Rocking the Boat

Obama may be re-elected, but he is no longer believed to be the change-agent he was in 2008, and the rock star politician aura has lost much of its shine.

FORBES: Falling Unemployment Make 2012 Tough Hurdle For Romney

Have they asked Obama -- the change agent -- whether he really wants Democrats to get back into that old class warfare argument?

CNN: Borger: Congressional Democrats messing up on health care