... maintenance dredging 维修挖泥 major emitter 主要排放源 major extensions or improvements to existing roads 对现有道路作重大扩建或改善 ...
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道路上的交通，甚至当道路是完全铺盖的情况下，也是灰尘、烟和悬浮质的主要排放源。
Traffic on roads, even when they are complete paved, is also a major source of dust, smoke, and aerosol emissions.
虽然个人电脑、手机和网络是主要排放源(约排放56%的废气)，数据中心的排放量增长却最快。
Although PCs, mobile phones and networks will account for most (56%) of this, emissions from data centres will grow the fastest.
机场不仅导致了噪声、交通堵塞、耕地流失，威胁鸟类，还是主要的污染源和温室气体排放源。
As well as the noise, traffic, loss of arable land and threat to birds, airports are a major source of pollution and greenhouse gas emissions.
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