It is abstract, though, so it is meant to be subclassed.
不过，它是一个抽象类，因而需要被细分类。
Spring provides a controller hierarchy that can be subclassed.
Spring提供了一个控制器层次结构，可以派生子类。
This constructor is public because PeriodicThread must be subclassed.
此构造函数是公有的，因为PeriodicThread必须扩展子类。
It provides an abstract class which must be subclassed to create portlets.
它提供了抽象子类来创建portlet。
Meanwhile, it was subclassed into plant vacuolar invertase by phylogenetic relation analysis.
系统进化关系聚类分析结果表明，该基因属液泡转化酶基因类型。
In programming, you can declare some interfaces and classes final so that they are not subclassed.
在编程时，可以将一些接口和类声明为final，这样就不能用它们产生子类。
You then learned how to create an ext JS extension-a browser window that subclassed the Ext.Window component.
然后您学习了如何创建一个ExtJS扩展—子类化ext. Window组件的一个浏览器窗口。
It can also be risky to start new threads inside a constructor, especially in a class that may be subclassed.
在构造函数内部开始一个新线程也是危险的，特别是这个类可能被子类化时。
The portlet class needs to be subclassed and the action needs to be intercepted before the existing view is rendered.
在呈现现存的视图之前需要再细分portlet类，也需要截取动作。
Because reference objects are implemented in close cooperation with the garbage collector, this class may not be subclassed directly.
因为引用对象的实现与垃圾收集器密切相关，所以该类不能被直接继承。
When an abstract class is subclassed, the subclass usually provides implementations for all of the abstract methods in its parent class.
通常当一个抽象类派生子类，子类提供了实现父类的抽象方法。
Notice that "external references" includes not just objects that are referred to, but external classes that can be used and even subclassed.
注意“外部引用”不仅仅包括引用的对象，还包括可以使用的类，甚至子类。
In the specific context of JCSP, an abstract class called Guard is provided, which must be subclassed by event objects that are competing for selection by a process.
在JCSP的特定上下文中，提供了一个叫作Guard的抽象类，竞争进程选择的事件必须继续它。
To achieve a degree of consistency between different interception points, it was decided to create a set of base classes that could be subclassed for each concrete interception point.
为了在不同的拦截点间保持一定程度的一致性而做出的决定是，创建一组基类，可以根据这些基类为每个具体的拦截点创建子类。
To achieve a degree of consistency between different interception points, it was decided to create a set of base classes that could be subclassed for each concrete interception point.
为了在不同的拦截点间保持一定程度的一致性而做出的决定是，创建一组基类，可以根据这些基类为每个具体的拦截点创建子类。
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