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  1. ozone hole

    英式

    • n.
      a region of marked thinning of the ozone layer in high latitudes, chiefly in winter, attributed to the chemical action of CFCs and other atmospheric pollutants. The resulting increase in ultraviolet light at ground level gives rise to an increased risk of skin cancer.
    • noun: ozone hole, plural noun: ozone holes

  2. 知識+