Kevin Balke, a research engineer at the Texas A&M University Transportation Institute, says that while smart lights can be particularly beneficial for some cities, others are so jammed that only a sharp reduction in the number of cars on the road will make a meaningful difference.

德克萨斯农工大学交通研究所的研究工程师凯文·鲍克说，虽然智能交通灯对一些城市特别有帮助，但有些城市太拥挤了，只有大幅减少道路上的汽车数量才能有效改变拥堵的局面。

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But it would not be enough to prevent a sharp widening of the output gap (the difference between actual GDP and what the economy could produce at full capacity).

但这也不足以阻止产出缺口的扩大(指经济能够完成的最大产出与实际产出的差)。

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In one respect his difference with Mr Obama is sharp as a pin.

在有一个方面他和奥巴马的差别非常明显。

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Saying the difference between a sharp recession and a depression is a loss of faith, economist Mark Zandi said a restoration of confidence will be key to recovery.

VOA: standard.2009.03.10

These so-called quantitative traits are under the control of a number of different genes acting in concert as opposed to qualitative traits such as human eye colour, where a difference in a single gene produces a single, sharp distinction.

ECONOMIST: A genetic game of chicken