effective

effective, efficient

• his teaching was not very effective.
  他的教学效果不好。
• the new interest rate becomes effective next month.
  新利息下月生效。
• when is the contract effective from?
  合同什么时候开始生效?
• this medicine, taken in time, can be very effective.
  这种药如果及时吃会很有效。
• my headache is much better. those tablets really are effective.
  我的头疼好多了，那些药片的确很有效。

• he needs an efficient secretary.
  他需要一个高效率的秘书。
• the staff was very efficient.
  工作人员效率很高。
• a good manager is both competent and efficient.
  一个好的经理既要胜任又要效率的秘书。
• the diesel engine is highly efficient.
  这台柴油机效率很高。
• our efficient new machines are much cheaper to run.
  我们高效率的新机器开起来要便宜得多。

形容词 effective:

1. producing or capable of producing an intended result or having a striking effect
   同义词：effectual, efficacious
2. able to accomplish a purpose; functioning effectively
   同义词：efficient
3. works well as a means or remedy
4. exerting force or influence
   同义词：good, in effect, in force
5. existing in fact; not theoretical; real
6. ready for service

1. This country lacks an effective party of the centre.
   这个国家缺少一个能起作用的中立党派。
2. The president promised swift and effective retribution against the terrorists.
   总统答应会迅速有效地惩罚恐怖分子。
3. Advertising is often the most effective method of promotion.
   做广告往往是最有效的推销方法。
4. Effective defence is a matter of intercepting their missiles before they can reach us.
   有效的防卫是不待对方导弹击中我们而先行将其拦截。
5. Commercial television is an effective medium for advertising.
   商业电视是有效的广告宣传工具。
6. Their efforts to improve the production have been very effective.
   他们提高生产力的措施卓有成效。
7. That's rather an effective use of color.
   这种使用颜色的手法效果相当好。
8. When does the new system become effective?
   新制度何时生效？

ef.fec.tive

adj.（形容词）

Having an intended or expected effect.
有效的：具有预期或先见效果的
Producing a strong impression or response; striking:
深刻印象的，惊人的：产生一种深刻印象或反应的；显著的：
例句：
gave an effective performance as Othello.
他在奥赛罗的演出令人印象深刻

Operative; in effect:
有效的：实施中；生效的：
例句：
The law is effective immediately.
这项法律立即生效

Existing in fact; actual:
实在的，实际的：事实存在的；事实上的：
例句：
a decline in the effective demand.
实际需求下降

Prepared for use or action, especially in warfare.
有战斗力的，备战的：为使用或行动准备的，尤指在战争中
n.（名词）
A soldier or a piece of military equipment that is ready for combat:
战斗力：为战斗作好准备的士兵或某一军事设备：
例句：
.The ‘company’ was no more than two platoons of effectives.(Tom Clancy)
.‘连’是不超过两排的步兵.(汤姆·克兰西)

【引伸】
effec.tiveness 或
ef.fectiv.ity
n.（名词）
<参考词汇><同义词>effective,effectual,efficacious,efficientThe central meaning shared by these adjectives is .producing or capable of producing a desired effect.:
这些形容词的中心意义是.产生或能产生期望的结果.：
例句：
an effective reprimand;
收效的惩戒；

例句：
an effectual complaint;
有效的批评；

例句：
an efficacious remedy;
灵验的药物；

例句：
the efficient cause of the revolution. ineffective
革命的有效原因 ineffective