动物粪便的流出物还污染了水道,未遮盖的粪堆释放出的氧化亚氮( N2O) ,还会污染空气。
Run-off from animal manure also fouls watercourses, and the release of nitrous oxides from uncovered dung heaps pollutes the air.
这些过滤装置将未燃烧的一氧化碳含量降至最低,降低空气污染。
These filters reduce air pollution by minimizing the discharge of unburned carbon monoxide.
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