efficient
efficient
adjective
efficiently
adverb
语源
adjective
- (especially of a system or machine) achieving maximum productivity with minimum wasted effort or expense
（尤指系统或机器）效率高的
fluorescent lamps are efficient at converting electricity into light.
荧光灯可以将电能高效地转换成光能。
■(of a person) working in a well-organized and competent way
（人）有能力的，能胜任的
an efficient administrator.
一位有能力的管理者。
■[in combination]preventing the wasteful use of a particular resource
节约的
an energy-efficient heating system.
一种节能的供暖系统。
efficiently
adverb
语源
- late Middle English (in the sense 'making, causing', usually in efficient cause): from Latin efficient- 'accomplishing', from the verb efficere (see effect). The current sense dates from the late 18th cent
考试词汇表
