建立仿真模型的实质是建立一种关系，这种关系反映外界条件变化时被模拟的实体的特性与行为的变化特征。仿真模型实际上就是实现上述诸关系的程序总体。建立仿真模型的中心思想是编程时采用面向实体的方法。程序实体是一种信息结构，它保证全面综合地模拟某一真实实体，包括描 The essence of establishing a simulation model is to establish a relationship that reflects the characteristics of the simulated entity and the changing behavior of the behavior as the external conditions change. Simulation model is actually the realization of the above relationship between the overall program. The central idea of ​​establishing a simulation model is to use an entity-oriented approach to programming. A program entity is an informational structure that guarantees a full and comprehensive simulation of a real entity,