这属于设计模式和其他结构描述的领域，并且因而趋向于更具抽象性和逻辑性，而非物理性。
This is the realm of design patterns and other structural descriptions, and thus tends to be both more abstract and logical rather than physical.
正向工程是对一个系统物理结构实现的高层抽象性、逻辑性及独立性设计的传统处理过程。
Forward engineering is a traditional process of moving high-level abstracts and logical, implementation-independent designs to the physical implementation of a system.
《数字电子技术》是逻辑性很强的一门课程，内容抽象难懂。
Digital electronics technology is a complex logical course, it is rather difficult to understand and abstract.
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