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。
Traditional festival is the major form of cultural memory and the link of cultural inheritance.
传统节日是文化记忆的重要形式和文化传承的纽带。
This class makes a link demand and an inheritance demand at the class level.
此类在类级别生成链接要求和继承要求。
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