fact＝to make（做），to do（做，为） 变化型 fect
1 (a) having an effect; producing the intended result 有效的; 产生预期结果的
*effective measures to reduce unemployment 减少失业的有效措施
* The law is no longer effective. 该法令已失效.
(b) making a striking impression 产生深刻印象的
*a very effective colour scheme 非常醒目的色调
* an effective speech 精彩的演说.
2 [attrib 作定语]
(a) actual or existing 实际的; 实在的; 现有的
*the effective membership of a society 现有的全体会员.
(b) fit for service or work 适于承担任务或工作的
*the effective strength of the army 军队的战斗力.
successful, and working in the way that was intended
≠ ineffective The cheaper drugs are just as effective in treating arthritis. the painting's highly effective use of colour Training is often much less effective than expected. the most effective ways of reducing inner city congestion [no comparative, not before noun]
if a law, agreement, or system becomes effective, it officially startseffective from The cut in interest rates is effective from Monday. [no comparative, only before noun]
real rather than what is officially intended or generally believed The rebels are in effective control of the city.>effectivenessn[U]
1. Ethanol is more effective at a concentration of 50-70 per cent; 乙醇的浓度为50%至70%时比较有效，
2. The law is no longer effective. 该法令已失效.
3. Though the costume consisted only of a sheet, it was very effective. 虽然那件化装服仅仅是一条被单,但效果很好.
4. They are effective supporters of the leader. 他们是领袖的有力支持者。
5. Though the costume consisted only of a sheet, it was very effective. 尽管化装服仅由一个被单制成，却十分逼真。
6. The most effective people never change from one situation to another. 给人印象最深的那些人从不随着情境的变化而改变自己。
7. The open body position is most effective when you place yourself within communicating distance of the other person — that is, within about five feet. 当你处于与他人交流的距离-即约五英尺以内时，采取开放的身体姿势，效果最佳。
8. Dark glasses is an effective shield against the glare. 墨镜能有效地保护眼睛不受强光刺激。
9. And that the boiled water from a bunch of them makes an effective insecticide. 沸水加一把烟蒂就成了很有效的杀虫剂。
10. A more effective technique is "reframing", which means consciously reinterpreting a situation in a more positive light. 较为有效的办法是"重新建构"，就是说有意识地以更积极的眼光来重新审度局面。