excess amount of dust
... excess air 过剩空气 excess amount of dust 过量尘埃 excess combustion air 过量燃烧空气 ...
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只消一根卷烟便可减缓将尘埃与细菌清扫出去的纤毛的作用，而过量抽烟则会将它们破坏殆尽。
Even one cigarette slows down the cilia that work to sweep up the dirt and germs, and heavy smoking destroys them completely.
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