它是第一个从国家科学院所确定的可持续性主要目标，即从生产力、经济效益和环境这几方面来比较有机农业和传统农业。
It is the first to compare organic and conventional agriculture across the main goals of sustainability identified by the National Academy of Sciences: productivity, economics, and environment.
探讨了培训项目开展过程中培训成本控制的原则、程序和措施，以达到经济效益最优化，实现自立生存的最终目标。
Probed into principle, procedure and measures of training cost control in training program development to realize optimum benefit and final target of self existence.
本文以综合经济效益最大为目标函数，对配电网无功优化方法进行了研究。
Reactive power optimization of distribution network has been studied in this paper, taking maximum synthetical economic benefit as objective function.
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