effect/effective

effect /iˈfekt/ I. n. 1.［c］&［u］影响，效果，作用:  lessen the effect of… 缩小…的影响；  produce evil effects 产生坏影响 It failed to bring about the desired effect. 它未能产生预期的效果。2. 用于短语：be in effect 有效；生效：Since 1995 the forty hour work week has been in effect. 双休日从1995年开始。have an effect on 对…有影响：The story has a healthy effect on children. 这故事对孩子们会产生健康影响。in effect 实际上，简直是：This is, in effect, an after thought. 这实际上是事后诸葛亮。come/go into effect 生效：The law went into effect yesterday. 这个法律昨天开始生效。 of no effect (作表语)没有作用：All our efforts were of no effect. 我们的一切努力都没有用。put/bring/carry into effect 使生效，实现：When will you put your plan into effect 你将在何时实现你的计划？take effect 生效；起作用：The medicine is taking effect. 药物正在产生效果。［考句］The new appointment of our president takes effect from the very beginning of next semester.我们校长的新任期从下学期开始。to the effect that/to that effect差不多或就是这个意思：He said something to the effect that he would have to change jobs if the situation continued.他说话就是这个意思，如果情况依然，他就得跳槽了。II. vt.使发生；实现，实行；造成，导致：The prime minister effected a great many policy changes. 这位首相在政策上实现了许多变革。The medicine effected nothing.此药不灵。

effective /iˈfektiv/ adj.有效的，生效的：［考句］They took effective measures to prevent poisonous gases from escaping.他们采取有效措施防止毒气泄露。 ［考句］It is reported that this medicine is effective against lung cancer.据报道这种药对肺癌有疗效。

［辨析］effective “有效的”，指解决了某个问题，取得了预期的效果。efficient “效率高”，指不浪费时间、精力或材料，指人时着重“能干、熟练、机警”。