The leakage through the valve causes the pressure drop.

通过阀的泄漏引起的压力降。

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However, the pressure drop occurs almost completely in the plug.

然而，压力降几乎完全发生在多孔塞中。

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Read the pressure drop across the valve with a Watts Series PG meter.

利用美国瓦茨系列PG仪器读出通过阀门的压降。

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They discovered a drop in pressure in the fuel cells that supplied electricity.

VOA: special.2009.06.24

We're going to drop the pressure, the volume is going to go up.

我们会降低压强，体积就会变大。

麻省理工公开课 - 热力学与动力学课程节选

In addition,the U.S.Air Force conducted its first airdrop of supplies on Monday, north of Port-au-Prince, using an aircraft that flew from the United States and returned there after the drop, easing pressure on the Port-au-Prince airport.

VOA: standard.2010.01.19

At its worst, the pressure drop corresponded to a leak five times the normal rate, but by late last week it was only twice the normal rate.

MSN: Crew finds ��culprit�� in space station leak

As a result, the "signature" of the pressure drop was very garbled, and sources told MSNBC.com that some space engineers argued there was no increased leak at all, but merely pressure changes caused by these other factors.

MSN: Crew finds ��culprit�� in space station leak

If the regulating valves fail or if the cabin structure is breached (by a failure of a door or window for example) then the pressure in the cabin would suddenly drop to match the outside air pressure.

BBC: NEWS | Europe | Dangers of aircraft decompression