noun
an area in the ozone layer where the amount of ozone has been very much reduced so that harmful radiation from the sun can pass through it
noun
an area in the ozone layer where the amount of ozone has been very much reduced so that harmful radiation from the sun can pass through it
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005