1.【生】亚纲;【数】子集(合)
1.a smaller group among several into which a main class is pided
2.a subpision of a class in the classification of plants and animals
1.Subclasses are often used to evaluate the completeness of the flow of events and the business rules.
子类常常被用于评价事件流的完整性和业务规则。
2.A protected field can be accessed by any method in the class in which it is declared or by any method defined in subclasses of that class .
声明该字段的类中的任何方法或者该类子类中定义的任何方法都可以访问受保护字段。
3.This must be implemented by subclasses of Permission, as they are the only ones that can impose semantics on a Permission object.
Permission的子类必须实现该方法，因为它是唯一的可以将语义强加于Permission对象之上的方法。
4.Methods that use references to superclasses must be able to use objects of subclasses without knowing it.
使用了对超类的引用的方法必须能在不知道子类具体类型的情况下使用子类对象。
5.WLM allows you to assign workloads with different response time requirements to different service classes and service subclasses.
WLM允许您将具有不同响应时间需求的工作负载分配给不同的服务类和服务子类。
6.Aggregating allows any number of extensions to be added, without the need for defining all possible combinations of subclasses.
聚合允许添加任意数量的扩展，而无需定义子类的所有可能的组合。
7.Note that type definitions for classes Order and Item appear in the schema, but type definitions for the subclasses of Item do not.
注意模式中有Order及Item类的类型定义，但是没有Item的子类的类型定义。
8.You can then use the base class, or any of the subclasses, in methods that are typed to expect the base class as a method argument.
然后您就可以在键入的以基类作为方法参数的方法中使用基类或任何一个子类。
9.It is also very easy to modify superclasses and add new subclasses because you merely need to modify or add one table.
修改超类和添加新的子类也非常容易，因为您只需要修改或添加一张表。
10.Further, since the response types are correct, the response contains the additional elements of the Item subclasses.
而且，由于响应类型是正确的，所以响应包含Item子类的附加元素。