There are prominent differences between traditional surface science underUHV conditions and catalysis in the real world, focusing on the so-called"materials gap"and "pressure gap".

在真空表面科学研究与实际催化反应体系之间存在着显著的差异，具体表现在所谓的“物质鸿沟”和“压力鸿沟”上面。

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To maximize energy output, the tapered towers funnel wind between them, creating a negative pressure zone behind the buildings that draws more air through the gap.

为最大限度发电，在两塔间形成了漏斗形的聚风口，使得在大厦后面形成一个负压区，有利于通过豁口吸入更多空气。

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A small gap that can form between the casing or liner and the surrounding cement sheath, most commonly formed by variations in temperature or pressure during or after the cementing process.

在套管或衬管与周围的水泥环之间所形成的小间隙，这些间隙是由于在固井期间或固井之后温度或压力的变化所致。

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The tax case against Cadbury comes as India's government, under pressure to bridge a budget gap, is seeking billions of dollars from multinational companies it says haven't properly valued transactions with their Indian subsidiaries.

WSJ: India Says Cadbury Used Phantom Factory to Avoid Taxes

As long as a big output gap remains, downward pressure on inflation will persist even if growth perks up.

ECONOMIST: Give growth a chance

With the demand from the backlight market nearing saturation and the general lighting market yet to take off, growth in demand has been slow, resulting in a huge demand-supply gap that has put pressure on the average LED selling price.

FORBES: Cree's Earnings: Looking For Signs Of A Sustained Recovery