Moreover, it can be used to assess economic performance both across countries and over time.

此外，它既可以用于对比国与国之间的经济业绩，也可以用于评估某个国家在某个时间段的经济业绩。

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With only one observation per country, it is impossible to control for unobserved heterogeneity across countries.

由于每个国家只有一个观测结果，因此不可能控制各国间未观察到的异质性。

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A main concern is that the failure of some banks or governments to pay their debts could send a financial shock across many countries.

VOA: special.2009.03.06

And there are some subtle and very interesting differences across countries and across people, but there's also deep universals.

有一些细微，有趣的不同,不同的国家和民族，但也有极大的全球统一性。

耶鲁公开课 - 心理学导论课程节选

What Backus, Kehoe, and Kydland did was look at how much the consumption correlates-- the movement from year to year-- correlate across countries.

巴克斯，凯赫和基德兰德做的就是,研究这些消费的相关性-,不同年份消费的相关性-,不同国家的不同运动规律。

耶鲁公开课 - 金融市场课程节选

Now the world is rebalancing - power and wealth will become more evenly distributed across countries.

BBC: Will the rise of the rest mean the decline of the US?

The disparity in wealth, language, and culture across countries raises a number of hurdles.

FORBES: 3 Ways To Hack Into Asia's New Social Boom

The first is that it is essentially like strategy in general, multiplied across countries.

FORBES: International Business Strategy: A Journey Of Its Own