Anslyzing energy efficiency of system and comparing conventional energy simply, The author put forwardefficiency-cost ratio of project and pre-evaluation of payback time.
对系统能效分析及与常规能源简单对比，提出项目费效比与回收年限预评估。
2
But the economic malaise and energy-efficiency programs in the U.S. brought forward the date of the milestone, Mr. Birol said.
不过比罗尔说，美国的经济低迷和节能计划把这一里程碑的时间提前了。
3
Finally, countermeasure is put forward to enhance its efficiency mainly by improving its administration.