A campaign is a planned set of activities that people carry out over a period of time in order to achieve something such as social or political change.
译文:运动是人们为了实现社会或政治变革而在一段时间内进行的一系列有计划的活动。
有些语境中,可以翻译为 charity campaign,例如:
The group has recently started a charity campaign called "Mubarak's Good, " which, they say, donates blood and babysits children in hospitals among other projects.