Part I: Putting the Domain Model to Work
A domain model is not a particular diagram; it is the idea that the diagram is intended to convey. It is not just the knowledge in a domain expert's head; it is a rigorously organized and selective abstraction of that knowledge. A diagram can represent and communicate a model, as can carefully written code, as can an English sentence.
域模型并非一種特殊的圖，卻是這種圖所要傳達的含義。它并不僅是域專家頭腦中的知識，它是嚴格組織出來的，并且有選擇的抽象的知識。一張圖示可以展現以及表達一種模型，同樣的，一段仔細斟酌的代碼可以，一句英文也可以。
In domain-driven design, three basic uses determine the choice of a model.
1.The model and the heart of the design shape each other.
2.The model is the backbone of a language used by all team members.
3.The model is distilled knowledge.
在DDD中，三種基本用途決定了模型的選擇。
1.模型和設計的核心交相輝映。
2.模型是所有團隊成員交流方式的中心。
3.模型是精化后的知識。