a subclass of 子集合
subclass of recursive set [数] 递归集子类
Subclass of antibody 抗体亚类
subclass of human igg 人igg亚类
a major subclass of crustaceans 甲壳纲动物的主要亚纲
If a subclass of one of these classes needed to override the default behavior, it could do so by overriding the method.
如果这些类中的任何一个的子类需要覆盖默认行为，那么可以通过覆盖这个方法实现。
Thrown to indicate that the code has attempted to cast an object to a subclass of which it is not an instance.
该异常的抛出，表明代码企图把对象的类型转换成一个子类，而该对象并不是这个子类的实例。
This means that no subclass of that class can declare a finalizer.
这意味着该类的任何子类都无法声明终结器。
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