efficient
单词辨析：
指有效用的或能产生预期效果的。
The government took effective measures to reduce the price.
政府采取了有效措施来降低物价。
The talks between both sides were effective in settling their disputes.
双方会谈有效地解决了彼此间的纠纷。
指产生希望或想要的结果的，只用于事物，如举措、药物、对策等。
The government hasn't worked out the effectual measures to combat unemployment.
政府尚未找到应对失业的有效措施。
Quinine is an effectual preventive for malaria.
奎宁是预防疟疾的有效药物。
既可指人也可指事物，强调不浪费时间、金钱、能源等的。
She is an efficient secretary.
她是一位得力的秘书。
The diesel engine is highly efficient.
这台柴油机效率很高。
相关例句：
Futurists agree that these trends will grow as telecommunications networks become cheaper and more efficient.
未来学家一致认为，随着电信网络资费的降低和效率的提高，这些趋势将会越来越明显。
The pill is the most efficient method of birth control.
服用避孕药是最有效的避孕方法。
The creation of an efficient and sustainable transport system is critical to the long-term future of London.
建立一套高效稳定的交通体系对伦敦的长远发展意义重大。
This machine is efficient.
这台机器效率高。
As we shall not deal with algorithmic problems, we leave the term "efficient" undefined.
因为不讨论算法问题，我们对“有效”这一术语不作具体解释。
It is a well and efficient exercise of medical aid.
这是一次出色的救护演习。