This is the key requirement for ensuring that a global system can be designed, built, and maintained efficiently and correctly.

这是确保全球系统能被正确有效地设计、构建和维护的关键需求。

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In this paper, we analyze the key techniques for the service precision of Global Navigation satellite System such as time reference, time synchronization, satellite orbit determination, etc.

对影响导航定位系统定位精度的各种因素进行了分析。研究了影响导航定位精度的关键技术问题，如时间基准、时间同步和卫星定轨等。

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Leaf area index (LAI) is not only an important attribute of land surface vegetation system, but also a key parameter for the models of global water balancing and carbon circulation.

叶面积指数LAI不仅是陆表植被系统的一个重要属性，而且是全球水平衡、碳循环等模型中的重要输入参数。

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The key to this global economic system was the importance placed on commercial activities by Islamic merchants.

ECONOMIST: The once and future boom

The agencies were set up solely to help Americans get cheaper mortgages, but they've become key parts of the global economic system.

NPR: U.S.-China Cash Flow Depends On Fannie, Freddie

And Europe is our largest trading partner and a key part of the global financial system, and therefore it's very important to the United States, and the rest of the world as they work through their issues.

WHITEHOUSE: Press Briefing