Although application of a single model is through a series of calculations, it still has limitation in practice, and the accuracy is not enough.

虽然使用单个模型是经过一系列计算优选得到，但在实践中单个模型进行分析时，仍存在较大的局限性，其准确性亦不够高。

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By showing how to associate the models we provide a basis for a unified analysis in which each analysis tool can do what it does best against the backdrop of a single model.

通过说明如何把这些模型联系起来，我们提供了统一分析的基础，在统一分析中每一个分析工具都能发挥它们在单个模型背景下所能发挥的最大作用。

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So far we discussed subprocesses and tasks from the perspective of a single process model, i.e., from a local point of view.

到目前为止，我们从单个流程模型的角度（也就是从局部的角度）讨论了子流程和任务。

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Many of you and your IT organizations began to evaluate and consider server virtualization technology a couple of years ago as a way to move beyond the legacy IT model of having a single operating system instance bound to a single physical server.

FORBES: MicrosoftVoice: Evolution of Enterprise IT and Virtualization Infrastructures to Private Cloud

If this is correct, it doesn't take a math wizard to understand that having a single radio module that works virtually anywhere means notebook vendors can build a single model of a product and ship it anywhere in the world, knowing it can be activated on any of today's commercial networks.

FORBES: Magazine Article

Ford and its business associates worked with researchers from Georgia Institute of Technology to create a computer model that calculates the electricity usage of a typical single family in their home for one year and the associated savings with moving to an energy-efficient lifestyle.

ENGADGET: Ford teams up with Eaton, Whirlpool and SunPower to create MyEnergi Lifestyle, hopes to reduce everyone's CO2 footprint