pollutant levels 中文意思是什麼
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Since a chief source of pollutants is automobile emissions, it might be expected that pollutant levels could be correlated with automobile traffic, at least to some extent.
因為污染物的主要來源是汽車的排出物，所以可以料想污染物的濃度至少在某種程度上是與汽車運輸有關。 -
If the water is not adequately circulated and used then pollutant levels would increase
假如海水沒有得到適當的循環及使用，便可能會增加污染物的數量。
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