在系统开发过程中，用硬件、软件或其两者对一个系统设计的具体实现。

In system development, the realization of a system design in hardware, software, or both.

用以修饰或说明为某一具体应用问题而专门设计和编写的软件，有别于，例如，应用软件包中的程序或者只读存储器（ROM）中的程序。

Pertaining to software that has been particularly designed and written for an application(as contrasted, for example, to a program from an application package or provided on ROM).

一种适于开发专家系统的语言、操作系统和软件包，它是由美国卡内基－梅隆大学开发的。

A combination of language, operating system, and software packages suited to the development of expert system. Developed at Carnegie-Mellon University.

初始设计开发阶段，首先必须发现可能存在的错误，并作相应的设计修改。正是在这个时期中，设计辅助程序、仿真技术和设计支援技术对于快速设计都是必不可少的。

The initial design development stage wherein, at first, it is certain that errors will be discovered which will require design changes. It is in this period that design aids, emulation techniques, and supportive design techniques are essential to quick design.