The class provides a series of static and abstract methods to work with one of the two sets of preferences: one for user preferences and one for system preferences.

这个类提供了一系列静态和抽象方法来操作两套首选项(其中一套是用户首选项，另一套是系统首选项)中的其中一套。

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They can see that user stories work well for short projects like their class effort, but they also see how use cases can tie things together and make system testing more effective.

他们会看到仅凭用户的故事可以在类似课上练习的小项目中发挥作用，但是他们同样会看到用例是如何将各种事情紧密联系在一起并且使得系统测试起来更加高效。

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In this paper, the class of search engine, work principle, system structure and the effect in digital library are discussed.

本文就搜索引擎的分类、工作原理、体系结构以及在数字图书馆中的作用做了一些探讨。

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"Northern Ireland has a lot to offer potential investors with our skilled work force and world class education system, " he added.

BBC: Peter Robinson and Martin McGuinness in Sao Paulo

In Britain we call this the class system at work.

BBC: Class calculator: A US view of the class system

He had been hired to work on a class of immune-system proteins called interleukins, but he had a better idea: He proposed, instead, that the two of them work on cloning the receptors for TNF.

FORBES: The Maverick and the Maestro