行动主义者

例句：

1. 1. He is an advocate for environmental protection and a strong supporter of the government's policies.
   他是一位环保倡导者和政府政策的坚定支持者。
2. 2. She is a prominent figure in the civil rights movement and has been a vocal proponent of equal rights for all.
   她是民权运动中的重要人物，一直是平等权利的坚定倡导者。
3. 3. The activists organized a protest to draw attention to the issue and demand change.
   这些活动人士组织了一场抗议活动，以引起人们对这一问题的关注并要求变革。