n. 因素, 因数, 系数, 基因, 代理人【计】 因式【化】 因子; 因素【医】 因子, 因素, 要素【经】 因素, 要素, 代理商

◆记忆方法一：
词根词缀记忆法：factor n 要素；动力（fact+or→促使人做的东西→要素；动力）,fac,fact,fect,fic,fig=make,do,表示“做，制作”

fact/factory/factor/act/actual/actually/active/action/react/reactionary
记忆：
1. act [ Akt ] n. 幕, 法案, 动作, 举动, (戏剧的)幕 vi. 行动, 担当, 表现, 见效 vt.扮演, 装作 A new act has just passed to regulate visitors’ acts. 已经通过了一条新法案来规范人参观者的行为。
2. fact [ fAkt] n. 事实, 实际 Facts speak louder than voices.事实胜于雄辩。
3. factor [ 5fAktE ] n. 因素, 要素 The traffic convenience is an important factor in deciding the place for a new factory.交通便宜与否是决定新厂址的重要因素。
4. factory [ 5fAktEri ] n. 工厂, 制造厂 This is the factory Mr. Wen Jiabao visited last month.这是温家宝先生上个月参观过的那家工厂。
5. actual [ 5AktjuEl ] adj. 实际的, 真实的 The actual situation is quite different from what he thought of.实际情况与他想象的大相径庭。
6. actually [5AktFuElI] adv. 实际上, 事实上 Actually, the air in his hometown is also seriously polluted.实际上，他家乡的空气也受到了严重的污染。
7. active [ 5Aktiv ] adj. 积极的 Lincoln was very active in politics when young.林青年轻时积极参与政治。
8. action [ 5AkFEn ] n. 动作, 作用, 战斗 Some action will be taken soon.很快就将采取某种行动。 格言：Actions speak louder than words.事实胜于雄辩。
9. react [ ri5Akt ] vi. 起反应, 起作用, 反抗 The public reacted strongly to the new tax act.公众对新的税收法案反应强烈。
10. reactionary [ ri(:)5AkFEnEri ] adj. 反作用的, 反动的 Those reactionary books have been burnt into ashes. 那些反动书籍已被焚之一炬。
另类阅读：
Actually, the success of a factory depends on many factors: being active in finding the facts, considering the reaction of others, taking proper actions, and so on. Anyway, think before act.