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。