In addition to a border, the Group composite sub-class supports a title.
除了边界之外，Group复合子类还支持标题。
The flag has three sub-flags: gc, class, and jni.
该标志有三个子标志：gc、class和jni。
Base class sub-objects may have zero size.
基类子对象可以具有零大小。
Though you call it with sub class object, it will run only base class implementation.
虽然你叫它的子类对象，它将只运行基类的实现。
Though you call it with sub class object, it will run only base class implementation.
虽然你叫它的子类对象，它将只运行基类的实现。
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