There is a bilateral link between an object and one of its deputy objects, which allows not only inheritance but also update propagation between them.
在对象和它的代理对象之间存在着双向连接，这样既能实现继承，又能实现更新迁移。
There is a bilateral link between an object and one of its deputy objects, which allows not only inheritance but also update propagation between them.
在对象和它的代理对象之间存在着双向连接，这样既能实现继承，又能实现更新迁移。
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