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.
于是这个代表这个IT系统或者它的一部分分析状态的拓扑模型，可能就不能表现那个单元的所有性能或者需求(或者甚至是成员)。
Thus the topology model, which represents the analytical state of the it system or its piece, may not be able to express all of the capabilities or requirements (or even the members) of that unit.
然而，与性能类似，这个拓扑模型中与单元相联系的需求就代表了这个单元的需求。
Similar to capabilities, though, requirements are associated with a unit in the topology model to represent the needs of the unit.
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