a colorless gas (O3) soluble in alkalis and cold water; a strong oxidizing agent; can be produced by electric discharge in oxygen or by the action of ultraviolet radiation on oxygen in the stratosphere (where it acts as a screen for ultraviolet radiation)
造句
用作名詞(n.)
CFCs cause depletion of atmospheric ozone. 氟氯化碳會損耗大氣臭氧。
Dyes have to be more resistant to ozone. 染料更能抵制臭氧。