activist

'æktivist

s. advocating or engaged in activism

n. 激进主义分子

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activist 由词根 act（行动）和后缀 -ist（表示从事某种职业或活动的人）组成，意思是“从事行动的人”，即活动家。

例句

1. The activist organized a rally to raise awareness about climate change.

这位活动家组织了一场集会，以提高人们对气候变化的意识。

2. Many young people are becoming activists for social justice.

许多年轻人正在成为社会正义的活动家。

3. The activist spoke passionately about the need for equal rights.

这位活动家激情洋溢地讲述了对平等权利的需求。