处理器将数据流解释为要执行的指令，它拥有一个或多个处理单元，用于执行整数和浮点运算以及更高级的计算。

A processor interprets a stream of data as instructions to execute; it has one or more processing units that perform integer and floating-point arithmetic as well as more advanced computations.

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活动(activity)是指令执行的一个单元，它是一个流程的基本组成部分。

Activity is a unit of instruction execution, and is the building block of a process.

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然后，它存储一个对PDOM中的单元文件的引用以及对所包含的指令和宏定义的其他引用。

Then, it stores a reference to the unit's file in the PDOM, along with references to the included directives and macro definitions.

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