One source of error is refraction, the bending of light beams as they pass through air layers of different temperature and pressure.

误差的一个来源是折射，即光束通过不同温度和压力的空气层时发生的弯曲现象。

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When a bad weather low moves in, air pressure lessens, and odors are released.

当恶劣天气到来，气压降低、气味释放。

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One technical difficulty is cavitation, where low pressure behind a turning blade causes air bubbles.

一个技术难题是气穴现象，一旦发生气穴现象，位于旋转螺旋桨叶后方的低压会产生气泡。

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Yet up at about five-thousand-four hundred meters the air pressure is only about half of what it is on the ground.

VOA: special.2011.04.06

When the differential is in positive territory (red) it means higher, stronger air over the North Atlantic pushes up on the low-pressure air over the Arctic circle.

FORBES: Snowpocalypse: Explained!

More has been spent on airports recently, thanks to aid from America and to the pressure of international air-safety groups, which try to ensure that aircraft landing fees are not spirited away by governments.

ECONOMIST: Africa��s unfriendly skies

The U.S. government has warned federal agencies in the past that pressure cookers -- air-tight pots used to quickly cook or preserve foods -- have been turned into bombs in parts of the world.

CNN: Source: Bombs were likely in pressure cookers in backpacks