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。
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。
From raw material to product design, from production to recycling, all of its activities are based on the concept of environmental protection, an essential element in the factories' successes.
从原材料到产品设计，从生产到回收利用，其所有活动都是基于环保的概念，在工厂'成功的基本要素。
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