Basing on the purpose and functions of risk management it illustrates the definition, character, classification of risk as well as the aim and process of risk management.
从风险管理的目的和意义入手，对风险的定义、性质、分类以及风险管理的目标和程序做了重要论述。
This paper mainly describes the concepts, character, classification, principle and the status of research and application of wetland wastewater treatment technology.
叙述了人工湿地污水处理技术的概念、分类、特点、原理及其在国内外的研究应用现状。
The purpose of this review is to provide a background of what was known concerning the pathogen classification, morphology, biological character and diagnosis.
因此，就附红细胞体病的病原分类、形态及生物学特征，以及该病的诊断方法等研究进展作其阐述。
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