臭氧洞 chòuyǎngdòng ozone hole Origin Definitions Defs Strokes Stroke Words Sentences Sents 臭氧 chòuyǎng noun abbreviation of 臭氧层 臭氧層 chòuyǎngcéng ozone layer the layer of the Earth's atmosphere that contains a high concentration of ozone, which absorbs most of the sun's ultraviolet radiation洞 dòng noun abbreviation of 空洞 kōngdòng cavity; hollow a physical cavity, void, or hole; physically empty or hollow inside