The turbines' spinning blades cause a drop in air pressure, which can kill bats.

涡轮机旋转的刀片导致风压下降，可能杀死蝙蝠。

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This can reduce the purchase cost, the more important is to be able to reduce the system pressure drop and air loss.

这样能降低购买成本，更重要的是能减小系统压降及空气损耗。

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The results showed that mass mean diameter (MMD), and drop size distribution parameter N changed with pressure drop, air velocity, and fuel viscosity.

结果表明，液雾的质量中间直径（MMD）和尺寸分布参数N将随着喷嘴压力降、空气流速、燃油性质而变化；

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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