与所有模型一样，这是实际情况的简化视图：例如，没有“正在开发”这样的中间状态，因为这种状态的定义是主观的，意义不明确。
Like all models, this represents a simplified view of reality: there are no intermediate states under development for example, since the definitions of such states are subjective and ambiguous.
为了把不明确的概念减少到最少――并和多数现代的其它模型语言形成对比――第一个标准化的UML定义是用元模型来指定的。
To minimize ambiguity -- and in contrast to most other modeling languages of the time -- the first standardized definition of UML was specified using a metamodel.
自动化意味着模型(以及后来的模型语言)的不明确和不精密的消除，所以计算机程序能转换并熟练地操纵模型。
Automation implies the elimination of ambiguity and imprecision from models (and, hence, from the modeling language) so that computer programs can transform and manipulate models.
内容模型必须是确定性的。通配符声明以及局部元素声明会导致内容模型变得不明确。
The content model must be deterministic. Wildcard declaration along with a local element declaration causes content model to become ambiguous.
每个模型做出不同假设，如何导引和确定哪些假设合理的方法并不明确。
Each model assumes something different, and it's not obvious how to navigate and identify which assumptions are reasonable.
每个模型做出不同假设，如何导引和确定哪些假设合理的方法并不明确。
Each model assumes something different, and it's not obvious how to navigate and identify which assumptions are reasonable.
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