汽车，工业和农业是伦敦及其城郊的主要污染源。
Car traffic, industries and agriculture are the main sources of pollution of London and areas nearby.
铁矿石烧结过程是二恶英主要污染源之一。
The iron ore sintering process is one of dioxin pollution sources.
汽车是空气的主要污染源，这个周末可以别开车了。
Cars, being the greatest source of air pollution, can be left at home this weekend.
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