这些模型在系统被设计和构建之前，提供了一种检查重要系统内容的方法，并因此为系统工程师提供了一种强有力的工具。
These models provide a way to reason about important system concerns before the system is designed and built, and thus offer powerful tools for the systems engineer.
因此，UML经常作为能够促进以模型为中心的开发的系统和软件设计方法的基础。
As a consequence, UML is often the basis for system and software design approaches that encourage model-centric styles of development.
软件和系统开发的模型驱动方法已经使用了一段时间了。
Model-driven approaches to software and system development have been in use for some time.
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