The theory and research about this new kind of structure has been done at some extend.

对这一新兴结构体系的理论研究正在铺开。

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Some folks say that you should not extend enumerated lists at all.

有些人认为根本就不应该扩展枚举列表。

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The site is currently limited to European destinations but Zoombu says it has plans to extend to North America at some point in the future.

该网站目前仅局限于查询欧洲的目的地，但Zoombu表示，现在已经有计划把业务拓展到北美洲。

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Because Congress is widely expected to change the law before year end to extend at least some of the tax cuts and reduce the spending cuts, the committee also projects that the debt will reach 89% of GDP by 2020 under more realistic assumptions.

WSJ: Obama Blasts GOP Budget as 'Trojan Horse'

At the same time, business needs to extend some social-insurance schemes to cover non-regular workers, and improve conditions for non-regular workers with such things as better child-care provision and more training.

ECONOMIST: Business in Japan

"If you think of the genetic diversity and the wide variety of cancer that were found, the simplest way I can imagine to extend the lives of the mice is to retard at least some important aspects of aging, " he says.

FORBES: Longevity