臭氧空洞 chòuyǎngkōngdòng ozone hole 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空洞 kōngdòng noun cavity; hollow a physical cavity, void, or hole; physically empty or hollow inside