臭氧层空洞的简称，指某些地区高空的臭氧层所含臭氧量显著减少，如同出现空洞的现象ozone hole

• 臭氧洞与全球气候息息相关。

  Holes in the ozone layer and the global climate are closely related.

• 北极出现了臭氧洞。

  A hole in the ozone layer has appeared in the Arctic.