按照定义，一个系统是一个自我包含的实体，包括所有的需要满足其业务目的或任务的资源。

By definition, a system is a self-contained entity that includes all the resources needed to satisfy its business purpose or mission.

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这样的协议一旦达成，则该工作流中的每个实体都可以在数据到达目的地时验证收到的数据。

Once this protocol has been agreed upon, each entity in this workflow can validate the data received when it arrives at its destination.

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请注意比较中 XML 实体的用法，这种用法的目的是为了转义引号字符。

Note the use of XML entitities within the comparison, in order to escape the quotation characters.

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Well you know what a point is, it's got an x- and a y- coordinate, it's natural to think about those two things as belonging as a single entity.

把这两个坐标认为，是属于一个独立的实体，是理所当然的事情,因此实现这个目的的。

麻省理工公开课 - 计算机科学及编程导论课程节选