Dynamic casts are needed when we have a reference or pointer to a base class but need to perform operations from the derived class that are not part of the base class.
当具有基类的引用或指针，但需要执行不是基类组成部分的派生类操作的时候，需要动态的强制类型转换。
Base on this, we present a kind of trust mechanism-based dynamic task scheduling model which imports trust mechanism by using interpersonal trust relationship in human society for reference.
在此基础上借鉴现实人类社会中人与人之间的信任关系模型，在任务调度过程中引入信任机制，提出了一种基于信任机制的动态任务调度模型。
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