To imitate one system with another,primarily by software,so that the imitating system accepts the same data,executes the same computer programs,and achieves the same results as the imitated system.

• 用另一系统来模仿一个系统，原则上由软件完成，使该模仿系统接收与被模仿系统相同的数据，执行相同的计算机程序，并得到与被模仿系统相同的结果。