activist

n person who takes or supports vigorous action, esp for a political cause 积极分子（参与或支持激烈活动的人, 尤指政治方面）.

acrylic, act, act as, act for, act on, act out, acting, actinism, action, action group, action painting, action replay, action stations, actionable, activate, activation, active, active service (US also active duty), actively, activeness, activity, actor, actress, actual, actuality, actually, actuarial, actuary, actuate, acuity, acumen, acupuncture, acupuncturist, acute, acute angle, acute mark, acutely, acuteness, AD, ad hoc,