Emissions mostly come from vehicle exhausts, factories, artificial fertilisers and manure from intensive farming.
氮排放主要来自汽车尾气、工厂、及集约化农业中使用的化肥和粪肥。
Swine manure composting with straw, was operated with mechanical aeration and artificial turning and conducted at low air temperature.
研究机械强制通风、人工翻堆以及低温对猪粪堆肥的影响。
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