XML database support is a key element of the On Demand Operating Environment, providing storage and retrieval of XML data in IMS databases.

XML 数据库支持是随需应变运行环境中的一个重要方面，它支持在 IMS 数据库中存储和检索 XML 数据。

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That complaint was repeated with each new version of Windows -- Apple was the innovator in the operating system space, and got there first with a host of key features.

每个新视窗版本出来都有这些老调重弹--苹果是操作系统领域的创新者，第一个拥有所有关键功能。

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But unlike regular processes, KVM guests contain a nested operating system, which impacts memory overcommitment in two key ways.

但与常规进程不同的是，KVM客户包含一套内嵌的操作系统，它以两种关键方式影响内存超量使用。

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If we build an engine for a car or anything else, it almost always is going to have some key element that's operating in a cycle, otherwise it won't keep going, right.

如果我们为一辆汽车，或其他什么东西制造一台引擎,它总要有一些关键，要素来形成循环。

麻省理工公开课 - 热力学与动力学课程节选

Blackberry's owner Research in Motion has said it is co-operating with a police investigation into claims that its BlackBerry Messenger service played a key role in organising the London riots.

BBC: Cameron suggests banning suspects from social media

Lithium-ion batteries are a key breakthrough that make electric vehicles far more practical in terms of operating range.

FORBES: Chevy Volt Battery Fires Threaten All Electric Vehicle Makers, Not Just GM

Jelly Bean finally puts Android on a par with Apple's iOS operating system, which drives the iPhone and iPad, in two key respects: responsiveness (when the hardware is potent enough) and elimination of the constant need to resort to menus, which plagued most prior versions of Android.

WSJ: From Google, the Toughest Challenger to the iPad