求翻译：风机采用德国原产直驱式高效离心风机，具有长寿命、低噪声、免维护、震动小、可无级调速等特性。工作寿命长达3万小时或以上。风机调速性能稳定，在高效过滤器终阻力的状态下仍可保证风量不变。是什么意思？

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The air blower uses Germany to produce originally drives the type highly effective gentrifugalism air blower straight, has the long life, the low noise, exempts the maintenance, vibrates slightly, may characteristics and so on stepless speed regulation.The working life for 30,000 hours or above.The

Wind machine adopts Germany original direct-drive high performance centrifugal fans, with long service life, maintenance-free, low noise, low vibration, can be made stepless speed and other features. Working life of up to 30,000 hours or more. Fan speed performance stability, high efficiency filter