Essential use cases are abstract, lightweight, technology-free dialogues between user and system.

本质用例描述了用户与系统间抽象、轻量级和技术无关的对话过程。

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It can be very useful to look at the total elapsed time and compare that with the user and system CPU times.

看看总耗时，并将其与用户和系统CPU时间相比较，这样做是十分有用的。

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In this article, we will address the user tree only, keeping in mind that the user and system trees behave identically.

在本文中，我们将只针对用户树，要记住用户和系统树的行为是一样的。

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That's not surprising as it's been among the few where the software giant has controlled "the whole widget" -- choosing the processor, designing the hardware, and developing not only the operating system and user interface, but a host of licensing standards, services and infrastructure supporting Xbox Live.

ENGADGET: Switched On: Pondering PC 3.0

There may not be any Mac viruses at the moment, and the way the system handles user accounts and security means that they are unlikely, but we need to take steps to safeguard ourselves against other malicious software.

BBC: Steve Jobs waits on stage, AP

Through a combination of anonymity technology and a sophisticated user-feedback system, Silk Road makes buying and selling illegal drugs as easy as buying used electronics and seemingly as safe.

FORBES: How Technology Complicates The War On Drugs: Guns And Drugs For Sale Online