cleaning n. 1.清洁法;扫除;清洗,洗涤;(种子的)清选。 2.〔常 pl.〕(牛、羊等的)胞衣。 3.【林业】除伐。 4.〔pl.〕垃圾。 5.〔口语〕(比赛等的)惨败,输光。 6.〔口语〕巨额利润。 a general [thorough] cleaning大扫除。 take a cleaning (球队等)惨败。
Abstract : this paper reviewed the automobile exhaust pollution . focus was especially put on the research of catalytic cleaning technology and catalyst for automobile exhaust . the direction of motor vehicle exhaust control technology development was forwarded 文摘:介绍了汽车尾气催化剂的研究发展,提出了我国汽车尾气污染控制技术的发展方向。