Passive systems of mitigation have been shown to be capable of reducing indoor radon levels by up to 50%.

无源的缓解系统已显示有能力使室内氡的水平降低多达50%。

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Pipes and cable trays are not hidden and most of ventilation and cooling is done through semi-passive systems.

管道和电缆架没有进行埋线，大部分的通风和制冷设施通过半被动式系统完成。

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These consist of shock absorbers, like those used in passive systems, but they can be adjusted to relax or stiffen when necessary.

这系统由防震器组成，如同在无源系统中使用那样，只是它们能在有必要时调整松紧。

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They can take advantage of environmental characteristics, like cool climate, to design more-passive systems.

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It uses so-called passive systems for cooling, such as the gravity flow of water and natural circulation based on thermodynamics.

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In particular, they don't have the passive safety systems that might have helped prevent the Fukushima accident in Japan.

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