域是类或类型并表示数据的规则、语法及语义(例如，它必需是整型、浮点型、图片类型等等)。

A domain is a class or type and indicates the rules, syntax, and semantics for a piece of data (for example, it must be an integer, float, conform to a picture, and so on).

youdao

如果需求、规章、策略或规则覆盖模型中的很多类、流程中的很多任务，分离出来的规则就要被明确地表示出来。

If a requirement, regulation, policy or rule spans many classes in the model and many tasks within the process, externalized rules are strongly indicated.

youdao

可以将这个类的实例看作规则文件中所包含规则的内存中表示。

You can think of an instance of this class as an in-memory representation of the rules contained in your rules file.

youdao