Hurricane Earl is moving north after churning off the coast of North Carolina's Outer Banks, bringing rough seas, rains and powerful winds to large parts of the eastern United States.

“厄尔”(伯爵)飓风在离开北卡罗来纳州外滩一带的海岸之后正在向北移动，给美国东岸的大部分地区带来巨浪和强风。

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Rough sets theory is emerging as a powerful tool as inducing knowledge classification knowledge from database.

粗合集合理论现在已成为数据库知识分类的一种强有力的工具。

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Rough set theory, a powerful tool to deal with incomplete information, has been widely used in the area of artificial intelligence, especially in data mining and knowledge discovery.

粗糙集理论作为一种处理不完备信息的有力工具，已广泛应用于人工智能的许多领域，特别是数据挖掘和知识发现领域。

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"It was powerful.It was rough.

VOA: special.2010.04.05

Rough parity among powerful nations is a source of uncertainty that leads to miscalculation.

WSJ: Robert Kagan on Why the World Needs America

And it really has been a rough and tumble campaign with both UKIP and Respect fielding powerful, experienced women candidates who have poured criticism on what they say is the unhealthy monopoly of Labour political power in the town.

BBC: Rotherham by-election sees 'rough and tumble' campaign

Now that we have a rough trade plan, we should also grant it to Mr. Market that he is all-powerful, and can do whatever he likes.

FORBES: Stock Market Rally Last Chance To Get Out Before Big Plunge