你通过鞋子带进家里的灰尘和有毒化学物质会使家里的空气质量恶化。
The dust and toxic chemicals you bring into your house via your shoes can deteriorate the air quality in your home.
烧煤是一件危害极大的事，释放各种有毒金属，并导致潜在的致命灰尘。
Burning coal is nasty business, concentrating all kinds of toxic metals and resulting in potentially deadly fly ash.
黏膜会过滤掉灰尘和有毒物质。
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