effective, efficient

• his teaching was not very effective.
  他的教學(xué)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?
  合同什么時(shí)候開始生效?
• this medicine, taken in time, can be very effective.
  這種藥如果及時(shí)吃會(huì)很有效。
• my headache is much better. those tablets really are effective.
  我的頭疼好多了，那些藥片的確很有效。

• he needs an efficient secretary.
  他需要一個(gè)高效率的秘書。
• the staff was very efficient.
  工作人員效率很高。
• a good manager is both competent and efficient.
  一個(gè)好的經(jīng)理既要?jiǎng)偃斡忠实拿貢?/li>
• the diesel engine is highly efficient.
  這臺(tái)柴油機(jī)效率很高。
• our efficient new machines are much cheaper to run.
  我們高效率的新機(jī)器開起來要便宜得多。

形容詞 efficient:

1. being effective without wasting time or effort or expense
2. able to accomplish a purpose; functioning effectively
   同義詞：effective

1. It is arguable that we would be just as efficient with fewer staff.
   我們的職員少一些也能發(fā)揮同樣效率，這是言之成理的。
2. I'll say this (for them), (ie I'll admit that) they're efficient.
   我得(為他們)說句話，他們很有能力。
3. The heating system has recently been modified to make it more efficient.
   最近供暖設(shè)備已稍加改動(dòng)以提高效率。
4. Mindful of the need to maintain efficient communication, the board of directors decided to construct a new communication network.
   董事會(huì)注意到維持有效通訊的需要，因此決定建立一個(gè)新的通信網(wǎng)。
5. "The new secretary is a quick, efficient worker, and the boss is quite satisfied with her."
   ＂新來的秘書是個(gè)敏捷的、效率高的工作人員，老板對(duì)她很滿意。＂
6. This is a highly efficient new heating system.
   這是個(gè)高效的新取暖系統(tǒng)。
7. He's efficient at his job.
   他勝任工作。

ef.fi.cient

adj.（形容詞）
Acting directly to produce an effect:
生效的：直接產(chǎn)生某一結(jié)果的：
例句：
an efficient cause.See Synonyms at effective
直接原因參見 effective

Acting or producing effectively with a minimum of waste, expense, or unnecessary effort.
高效的：以較少的浪費(fèi)、花消、或不必要的努力去做或生產(chǎn)
Exhibiting a high ratio of output to input.
功效大的：產(chǎn)出與投入比值高的

來源：
Middle English
中古英語
from Old French
源自 古法語
from Latin efficiôns efficient- [present participle of] efficere [to effect] * see effect
源自 拉丁語 efficiôns efficient- [] efficere的現(xiàn)在分詞 [生效] *參見 effect

【引伸】
effi.ciently
adv.（副詞）