本文着重于宏观的迭代维度，介绍演进的概念，表现出多重，重叠地通过RUP生命周期。
This article focuses on the macro-iterative dimension, introducing the concept of evolutions, which represent multiple, overlapping passes through the RUP lifecycle.
如果模型中出现太多重复，那就需要扩展建模语言以覆盖更多的概念。
If there is too much repetition in the models, then the modeling language will need to be extended to cover additional concepts.
如果你对数学上多重集的概念有所了解，就会知道计数器是一种对多重集的表示方式。
If you are familiar with the mathematical idea of a multiset, a Counter is a natural way to represent a multiset.
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