Once a cost reduction program loses momentum, it eventually dies out. 一旦降低成本計劃失去了活力，它最終就會(huì )消聲匿跡。
Designing air cleaner with good performance of noise reduction is one of the effective ways for the intake noise control. 設計消聲效果良好的空氣濾清器是控制發(fā)動(dòng)機進(jìn)氣噪聲的有效措施之一。
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