由用户定义让计算机去完成的一种工作单位。习惯上说，“作业”这个术语通常指的是作业的一种表述，这种表述可以包括一组计算机程序、一组文卷及一些给操作系统下达命令的控制语句。
A unit of work that is defined by a user and that is to be accomplished by a computer. Loosely, the term "job" is sometimes used to refer to a representation of a job. This representation may include a set of computer programs, files, and control statements to the operating system.
验证协议的程序，它从一个给定的初始状态机械地产生出一切可以到达的状态，并且审查每一状态下用户定义的条件的有效性。
A program for protocol verification which mechanically generates all states reachable from a given initial state and checks the validity of user defined conditions in each state.
