Knowledge economy is characterized by centering knowledge as essential production element, which attacks the foundation of traditional cost management.
知识经济以知识为核心生产要素的特征，冲击了传统成本管理的根基。
Production planning was seen as an essential element in improving efficiency. Why might that be the case?
生产计划的编制被认为是提高效率的关键因素，为什么？
Tobacco is an important economic crop, and nitrogen is essential mineral element. Studies on carbon and nitrogenous metabolism of tobacco have important action on tobacco production.
烟草是中国一种重要的经济作物，而氮是植物必需的矿质养分，研究烟草碳氮代谢规律，对指导烟草的生产具有重要的作用。
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