一个基本单元。
单元就是代表拓扑模型中一个部署单元的基本类型。
Unit is a base type that represents a unit of deployment in a topology model.
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.
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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