efficient

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 efficient:

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

1. It is arguable that we would be just as efficient with fewer staff.
   我们的职员少一些也能发挥同样效率，这是言之成理的。
2. I'll say this (for them), (ie I'll admit that) they're efficient.
   我得(为他们)说句话，他们很有能力。
3. The heating system has recently been modified to make it more efficient.
   最近供暖设备已稍加改动以提高效率。
4. Mindful of the need to maintain efficient communication, the board of directors decided to construct a new communication network.
   董事会注意到维持有效通讯的需要，因此决定建立一个新的通信网。
5. "The new secretary is a quick, efficient worker, and the boss is quite satisfied with her."
   ＂新来的秘书是个敏捷的、效率高的工作人员，老板对她很满意。＂
6. This is a highly efficient new heating system.
   这是个高效的新取暖系统。
7. He's efficient at his job.
   他胜任工作。

ef.fi.cient

adj.（形容词）
Acting directly to produce an effect:
生效的：直接产生某一结果的：
例句：
an efficient cause.See Synonyms at effective
直接原因参见 effective

Acting or producing effectively with a minimum of waste, expense, or unnecessary effort.
高效的：以较少的浪费、花消、或不必要的努力去做或生产
Exhibiting a high ratio of output to input.
功效大的：产出与投入比值高的

来源：
Middle English
中古英语
from Old French
源自 古法语
from Latin efficiôns efficient- [present participle of] efficere [to effect] * see effect
源自 拉丁语 efficiôns efficient- [] efficere的现在分词 [生效] *参见 effect

【引伸】
effi.ciently
adv.（副词）