Because a use-case model is defined from a business analyst's view, it provides a level of abstraction that's a useful communication tool for project stakeholders.
因为用例模型是从业务分析师的视角定义的，所以它提供了一种层次的抽象，对项目相关者来说是有用的沟通工具。
You can easily take the lessons from this article and apply them to petabytes of logfiles; that is the essence of why the MapReduce abstraction is a useful tool, especially in a cloud environment.
您可以应用从本文学到的知识处理数PB的日志文件；因此，MapReduce抽象是一种非常有用的工具，尤其是在云环境中。
Chimps can do all sorts of things we thought that only we could do - like tool-making and abstraction and generalisation.
猩猩能够做很多我们认为只有我们才能做的事——像制造工具、抽象和归纳。
The paper describes a CAD tool, it can perform GaAs device simulation, device parameter abstraction, circuit simulation, layout edition and PG tape generation.
介绍了一套砷化镓专用电路CAD软件，它可完成砷化镓器件模拟、器件模型参数提取、电路模拟、版图编辑、PG带生成的全过程设计。
The paper describes a CAD tool, it can perform GaAs device simulation, device parameter abstraction, circuit simulation, layout edition and PG tape generation.
介绍了一套砷化镓专用电路CAD软件，它可完成砷化镓器件模拟、器件模型参数提取、电路模拟、版图编辑、PG带生成的全过程设计。
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