线程是操作系统分配处理器时间的基本单元，并且进程中可以有多个线程同时执行代码。
Threads are the basic unit to which an operating system allocates processor time, and more than one thread can be executing code inside that process.
在该模型中引入仿真对象并将其作为仿真处理的基本单元；引入事件发生的时间属性并将其作为时序的依据，使并行执行的事件能被正确有效地处理。
In this model, a simulative object is considered the basic unit, and complex events' time-stamp is discussed, which is used as a proof to make parallel events be processed correctly and effectively.
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