从建模的观点来看，由此带来的挑战是如何描述设计良好的操作、服务和流程抽象的特征以及如何系统地构造它们。
From a modeling standpoint, the resulting challenge is how well-designed operation, service, and process abstractions can be characterized and constructed systematically.
物证信息从观念层面过渡到操作层面必须依赖物证特征及物证结构作为中介。
When transferring the information of physical evidence from ideal level to practical level, we must have had some link age so called the feature and structure of physical evidence.
文章从管理运筹学教学特征出发，针对学生运筹思维能力、实际应用能力和实际操作能力的培养和提高，提出了“3+2”教学模式。
To cultivate and improve students' ability in operational thinking and application, the author present a "3+2" model in teaching reform.
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