Traditionally they have worked in the mainly empirical sub-macro realm of unit operations, with some analysis of microscopic phenomena and macroscopic plant design.
化学工程师们传统的工作领域是以经验为主的半宏观的单元操作，结合一些微观现象的分析和宏观的工厂设计。
Nitrogen, phosphorus, potassium are essential macro elements to plant growth, and also commonly used fertilizer in agriculture.
其中氮、磷、钾是植物生长必需的大量元素，也是农业生产中常用的肥料。
A macro-economic ratio that compares actual output to potential output, the maximum possible production in a given period of time, using existing plant and equipment.
宏观经济指标之一，是实际产出与产出能力的比率。产出能力指在一定时间内利用现有的厂房和设备所能生产的最大产出量。
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