activist
US /ˈæk.tə.vɪst/
UK /ˈæk.tə.vɪst/

1.
活動家, 積極分子
a person who campaigns to bring about political or social change
:
•
She is a well-known environmental activist.
她是一位著名的環保活動家。
•
The human rights activist spoke passionately about justice.
這位人權活動家熱情地談論著正義。