In Oklahoma city's flood on Monday, says Sowko, there was a low-pressure area to the west of the city.

sowko说：星期一发生在俄克拉荷马城的洪水，在城市的西部有低压区。

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Ordinarily, this is a low-pressure area which has the effect of sucking the truck backwards, something that adds to the rig's fuel consumption.

通常情况下，车后区域空气压力很低，对卡车会产生一个向后的吸引力，增加燃油的消耗。

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The low-pressure area reduces wind resistance and hence the amount of drag, which means less energy is needed to maintain the same speed as the leader.

在低压力区，空气阻力减少，向后拉的力量减小，因此只需要消耗较少的能量就可维持与在前面的竞争对手相同的速度。

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More specifically it describes a low-pressure area whose center of rotation is just off the East Coast and whose leading winds in the left forward quadrant rotate onto land from the northeast.

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With high pressure now established up from the southwest in the eastern North Atlantic - and an area of low pressure being held further west of Ireland - this year's festival continues on a settled and increasingly warm note.

BBC: Glastonbury Festival 2010 weather forecast