The devices direct oncoming air around the trailer in such a way that it increases pressure in the area of the slipstream immediately behind the vehicle.

该装置将迎面而来的空气引向拖车周围，可立即增加车后部滑流压力。

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This decreases the quantity of air in that area, and therefore decreases the atmospheric pressure.

这使得该地区的空气质量减小，因此减少了大气压强。

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This method is based on the measurement of the rate of air flow through a given area of fabric by a given pressure difference across the fabric.

这个方法是基于对空气流速的测量：在一块既定面积的面料上，通过面料两边不同的压差来获得。

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All this wet air is pulled in by a high pressure area over the Indian Ocean and a low pressure area to the south.

VOA: special.2010.05.25

Spreading the area of air pressure over the jet staggers the sound waves and decreases the intensity of the boom.

CNN: Bang goes the sonic boom