active /ˈæktiv/ adj.积极的，活跃的：be active in politics积极参加政治活动；still lead an active life in winter冬天仍过着活跃的生活；take an active part in 积极参加
activist /ˈæktivist/ n.［c］ 激进主义分子，行动主义分子：a political activist政治上的积极分 子He's been a trade union activist for many years.多年来他一直是工会的积极分子。
activity /ækˈtiviti/ n. 1.［u］活跃或积极状态，活动(总称)：productive activity 生产活动; activity in trade 商业活动 2.［c］(多作pl.)具体活动：engage in social activities 从事社会活动
