Already during the 13th century, domestic coal consumption in London is said to have been so great that restrictive by-law became necessary to check the increasing smoke nuisance.
早在13世纪，据说在伦敦家庭煤的消耗就很大，所以必须制订限制性的地方法规来检测不断增加的烟雾污染。
The necessity of introducing exhaust particulate trap in domestic automotive diesels was discussed on the basis of the present exhaust smoke situation.
根据国产车用柴油机的排气烟度现状，论证了采用排气微粒过滤器的必要性。
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