A longstanding and common design pattern for data modeling is the division of the data model into three parts: a conceptual model, a logical model, and a physical model.
数据建模中一种常见并被长期使用的设计模式是将数据模型分为三部分：概念模型、逻辑模型和物理模型。
The key and difficulty of the modeling is how to solve the problem that different parts of the complex target occlude each other and light scatters in the target.
对于卫星等复杂空间目标，进行光散射建模计算的关键点和难点是解决复杂目标不同部件之间的遮挡关系和光线在目标内部的再次散射问题。
With the wide use of the computer control systems, the topics of modeling, analysis and design of the discreted-time control systems have become important parts of the classical control theories.
计算机控制系统的广泛应用，使得离散系统的建模、分析以及设计在经典控制理论的教学中处于愈来愈重要的位置。
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