除了失重之外，大气成分(二氧化碳浓度)、环境噪声等级、压力水平等都不一样。

In addition to weightlessness, the atmospheric composition (CO2 levels), ambient noise levels, stress levels, etc.

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这样，由于转动 体171的通过振动不会被共振频率放大，因此可以抑制噪声等级的增 大。

Thus the utility model can inhibit the increasing of the noise grade as the vibration of the rotator 171 is not amplified by the resonance frequency.

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马达轴26和风扇28的这种相对较低速度的旋转使得空气清洁器10在相对较低的噪声等级下运转。

Such a relatively low speed rotation of the motor shaft 26 and fan 28 permits the air purifier 10 to operate at a relatively low noise level.

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