Single item concept — An item in the assembly data model describes a single primitive value that corresponds to a primitive type.
单项概念 — 程序集数据模型中的一个项目 描述一个与原始类型对应的原始值。
2
A reminiscence of the concept of the dream that was held in primitive times seems to underlie the evaluation of the dream which was current among the peoples of classical antiquity.
回顾历史，古典时代各个民族对“梦”的普遍认识似乎正是以原始时期的“梦”概念为基础的。
3
The concept of Design by Contract allows you to define some constraints and invariants of your class. Statically typed languages have a primitive version of this.