臭氧層 chòuyǎngcéng ozone layer Origin Definitions Defs Strokes Stroke Words Sentences Sents 臭氧 chòuyǎng noun ozone ozone; an allotrope of oxygen with a strong odor, often used as a bleaching agent or for disinfection层 層 céng noun layer A physical sheet, thickness of material, or stratum covering a surface