activist
n.美 /ˈæktɪvɪst/英 /ˈæktɪvɪst/
积极分子；社会活动家
a person who works to bring about political or social change
例句
Many young environmental activists joined the clean-up campaign.
许多青年环保积极分子参加了清洁行动。
She became an activist after learning about climate change.
了解气候变化后，她成了一名社会活动家。
怎么记
active + -ist（人）
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